I consider cryptocurrencies to be a big step at the development of technologies. I think that those countries which are adopting crypto now, will benefit a lot in the future. On the other hand, not all authorities approve of crypto. It is decentralised and uncontrolled, so they can't regulate it, that is why they can't let it develop as they don't want to lose control over finances.

Only those people who adopt and enjoyed using Bitcoin will gain some benefits but not all. What I mean is that even the country is legalizing and adopting Bitcoin it doesn't mean that all of their countrymen are also using this, many were still not seeing this as beneficial but just a useless technology especially when they can never use it to buy and pay our bills.
That is why I don't think it was necessary nor it is a must coz we are still able to survive without this thing. Kinda be optional.

Cryptocurrency is just one of those areas that the world has shown to be advanced, so it isn’t bad if we also have it and make use of it, but that doesn’t mean that without cryptocurrency that the world won’t be able to develop. Moreover, if you look into this you will see that mostly what we need cryptocurrency for is just for transaction and for investment, unless you’re talking about the blockchain which can be implemented in different areas in the industries. At the same time that we have lived centuries without having cryptocurrency and the world was able to develop. So, if we should take out cryptocurrency today we’re still going to be able to keep developing but with cryptocurrencies we might have different growth rate due to its obvious applications.

speaking of criminal matters, the thing that needs to be understood is that even Fiat is still often used for criminal matters, well that's a fact.
however, since most cryptocurrencies are decentralized, the reason the government doesn't accept it as a means of payment is because it has an unstable value, and there are many other reasons. however, whether it is important or not depends on a country using it. if it can make people prosperous, then I think it can be important. however, like in China, I think cryptocurrencies are considered a disadvantage there.

If you say it is important for the development of the country, I think your statement is not objective, crypto as an investment vessel for the benefit of its users. If crypto can overcome the instability of a country, I think all countries in the world will use crypto and there is no country in the world that prohibits it. I can't say crypto will give negative value to countries that legalize it. Looking at crypto users, they get the positive side which is financial freedom. It is possible that crypto will have a better impact on everyone in the world if they continue to invest in it.

First and foremost, Crypto and more specifically, Bitcoin was originally created to bring financial freedom for anyone or entity that chooses to adopt crypto but overtime, it has been more about the investment side and not overall adoption but I believe it's just for the time being and we'd see real adoption soon. Countries that adopt bitcoin shouldn't have any problems from what we have seen so far with El Salvador.

How can it be essential? Even there are countries that have nothing to do with crypto business, they ban crypto because of certain reasons. This indicates that crypto isn't essential, it is just a part of various businesses in the world. However, crypto can be helpful to improve society's incomes, some countries have adopted the crypto business because of the demands from its society.

crypto can essential of the development of country, it's depend on adoption of crypto. but the governments don't care attitude and don't wants to legalize also promoting it negatively. crypto will never replace fiat, so it will not play role essential development for a country as fiat. absence of crypto i don't think its will effect of the development.

Actually, crypto currencies could provide a significant benefit by overcoming the lack of social trust and by increasing the access to financial services as they can be considered as a medium to support the growth process in developing countries by increasing financial inclusion, providing a better traceability of funds and to help people to escape poverty, and that's not only my opinion.