Salaries coming from the government pocket is a No, it's never going to work, but if you are working in tech companies that belong to private personnel then you can bring up the idea of getting paid in Bitcoin and that is left for the owner to accept.

Some jobs online pay their workers in Bitcoin but not all of them, some have the option to choose which payment method you prefer.

The government has no reason to pay its people in decentralized digital money, that's like a slap to their faces.

If you are a big store owner or business owner you can start accepting Bitcoin payments, It makes my Bitcoin accumulation to be more easier instead of buying directly using Fiat.

Perhaps the only country currently offering this facility is El Salvador. El Salvador is a country where you can get all the benefits with Bitcoin. There are two local currencies in El Salvador, one is their own currency and the other is Bitcoin, that is, if you work in that country and want to receive your salary through BTC, they will give you this benefit, but you will not get this benefit in any other country. If you have to pay for work in any other country, then you have to pay your work remuneration through the local currency of that country. Because no other country except El Salvador has officially accepted Bitcoin directly, so you will not get this benefit from other countries.

Let's imagine that in a country such as Ukraine the salary package can offer you a choice: you can choose between being paid in UAH (Ukrainian Hryvna) or BTC (UAH equivalent).
 The first problem with BTC salary is the question: how the government should monitor this process.
 The second problem is the necessity of exchange BTC into Ukrainian Hryvna.
 The third problem is the possibility to buy something in BTC in Ukraine.

1. Problem. The Government
For instance, I get 0,3 BTC as a payment for my work. I want to buy something with it, using exchange services. How does tax rules may apply to my situation?
There are two scenarios:
1) Tax regulator may provide rule, that I obliged to pay taxes from BTC or any other crypto-earnings in a moment, when i try to exchange BTC in Ukrainian Hryvnas. So, the tax regulator must gain access to monitor my account, where I hold my earnings in BTC to confirm the tax rate of operating due to the rate of BTC itself on the market.
For example, I sold 1 BTC for exchange rate 1 to 30 0000 (in USDT) and then I need to sell USDT for Ukrainian Hryvna (37 Ukrainian Hryvnas for 1 USDT). So, there are two operations, which will be taxed for approximately 20%.
I do not see the possibility of giving monitor access to the tax regulator willingly by my side due to the nature of the crypto-currency.
Also, I do not see the possibility for the government in our time to track all operations in crypto in Ukraine without gaining access to holders account without their willingly cooperation and willingly verification that they are truly the owners of crypto-account.
So, we can make an assumption, that the possibility of that option is low enough.

2) Tax regulator may provide rule, which states, that all operations of income in BTC (or in any crypto) should be taxed immediately after the crypto has been received into the account.
This helps regulators to track the rate between BTC, USDT and Ukrainian Hryvna, but also this may give a chance for companies to pay salary when the rate is low, so there is an open source of manipulation, which only can be reduced to zero by a law, that will oblige companies to pay salaries in a specific time (which opens a new window for market manipulation)
I don't see this option as vital.

2. Problem. The Exchange
Do I really have an option to spend a BTC as easy as Ukrainian Hryvnas in stores? Well, some fancy stores which sale technical staff such asL iPhone, MacBook, Dyson and Marshall sound design may include crypto as a payment, but mostly crypto payments won't be accepted on 98 % of  Ukrainian stores.
Answer is simple - there is no legal changes in tax law (Code of Taxes),  but there is a law for cryptocurrency. It means that crypto is legal, but income of it is questionable, and banks will block any payments in that form of payment.
So, I need to to change BTC in Ukrainian Hryvnas constantly (BTC into USDT, USTD in Ukrainian Hryvnas).
One day banks may ask where do i get my money, and due to reasons that I've written above, there can not perceive my BTC earnings a legal. So, my only option is cash and low-budget buyings.

3. Problem. Possibility of buying

We estimated above, that earnings in BTC are possible, but buying something may seem not so possible. OF course there are shady schemes that will help you out to buy something like an apartment for yourself in BTC, but you won't have a reliable paper for the kind of operation due to absence of legal tax regulation, therefore where will exist questions about operation itself.
For things like iPhone, stores may also use shady schemes, but the amount of money not so sufficient as buying a flat.

As a conclusion, I may suggest that BTC salary in Ukraine is highly questionable due to restricted areas of spending BTC, absence of tax law for that kind of operations and non-transperent monitoring of that operations by the government.

This is difficult to do, but not impossible. At least to start with, they can get some of their salary in bitcoin. For example, 10% of it. In this way, everyone working in the company has invested in Bitcoin. Some sell the day they are bought, while others hold it as an investment. Such things can be done, but I don't think they will accept their full salary in Bitcoin. Maybe if they just have the money they earn as a bonus, the company can pay that amount in Bitcoin.

Will not make any difference I would say. Companies in the past tried this model, it just adds another step to the payee to convert it back to actual money to pay his expenditures and bills.
If we are talking about freelancing or a contract that is an online mode, there I can see a big role of Cryptocurrency or Bitcoin in general. As it will allow them to pay for the work instantly without worrying. In the actual world, no big corporation will be doing this anytime soon.

So far I don't really know which country your friend is referring to, but if it refers to a freelance organization or online-based work it might make sense. It's just that when bound the government is still unsure because the government remains in the corridor of fiat which is its responsibility in order to carry out economic growth. Fiat makes the only legal means of payment in any country, even though it implements the second payment option, fiat's position is still number 1 as salary distribution.

If your friend insists that it was found in a certain country, of course there are already laws governing it, but back when employee salaries use Bitcoin, we can see the impact so far.

That's going to be a good idea in the cryptocurrency ecosystem by implement Bitcoin as a means of salary payment, which we open more civil servants eyes on crypto calculation base on Bitcoin price fluctuations and with that most of people we like to invest anytime price of Bitcoin as long government has approved using Bitcoin as a means of payment.

I've heard of some tech companies offering their employees the option of part-paying in crypto but that was years ago. And I didn't hear anything else from the company. (Sourch) But to be honest, I don't really know whether a country that only considers Bitcoin and Crypto as commodity assets can allow a company to pay its employees in crypto? will it be legal or not? I'm quite curious about this. and maybe will try to find out about the laws in my country regarding this matter. Although at this time I think that it all depends on the agreement of the employees and the company concerned. But what is clear in my country is that maybe no one has paid their employees with Crypto yet. Or maybe I just don't know about this.

Salaries paying through Bitcoin is not a bad idea, but that's if Bitcoin is accepted in your country, on the other hand if the managing director of a company decided to pay his/her workers with Bitcoin the workers have no right to question it because he has the company and he knows what's good for the company, besides if an M.D decides to pay workers with Bitcoin he might have seen the positive side of it, so this are the country that allows salaries to be paid through Bitcoin, also this are the names of companies that pays their workers salaries through Bitcoin, and this are some companies that you can make payments through Bitcoin, is like I have seen similar threads that has same points or whatever.

Mostly in Africa, we need such as payment option in Africa, and as you said the government will not permit that but if the private institutions use it to pay their workers and when the public servants see the benefits from the private workers there will be an agitation or protest to adopt it in the public domain (public offices). But we should also consider the flustrating nature of bitcoin so if bitcoin is used as payment option, there are so me months salaries might be reduced and some might be higher. So we have to think of all the areas before adopting to pay.