Money orders, like checks and other demand instruments, are reversible (in certain circumstances), while bitcoins on the other hand, are not.
  "A money order can be lost or stolen and there are procedures for reporting that. Losses could occur even weeks after the check has cleared"
  - http://en.bitcoin.it/wiki/Payment_methods

Possibly in your country you have a hard time to get and purchase bitcoins but in our country it is just a matter of minutes. In the Philippines we have the coins.ph bitcoin exchange wherein it has a feature that you can buy bitcoins at the remittance centers and banks and after the deposit the bitcoin will be credited on your balance in just minutes. Pretty cool isnt it.

True, OP is quite old, but it is still can be useful for some people.

It is rather a question of how much information you are ready to provide to buy cryptocurrency. The bigger amount of crypto requires complete verification and a bank account. If you are ok with buying little amounts of crypto, then buying with both cash and credit or debit cards is easy and fast. If you are considering a purchase of large amount, it would be better to make it with bank account or bank transfer.

Here are some good ways to buy large amount of crypto https://www.buybitcoinworldwide.com/buy-bitcoin-bank-transfer-account/

One of the biggest issues with making it convenient and quick to buy bitcoins is the fact that most of the payments are irreversible whilst bitcoin and other cryptocurrencies are not. Many exchanges are trying to save themselves the hassle by using the most secure payment options which usually result in a bit more inconveniences. However, as its becoming easier and easier to trace people down I believe soon it will be easy to purchase bitcoins almost as easy as buying gift cards, or some shopping online.

For encashing the money most of the people go with the local exchanges do that work but if you want to convert the bitcoin into cash you can always use the localbitcoins.com as the way pipeline for it bro.
Then you cannot find the many exchanges with that option due to they are operating with the decentralized medium mate.

I think a lot of exchanges don't have fiat option because of the legal routine it entails. If you use fiat, you need to pay taxes and register everything officialy, while as crypto is unregulated in most countries you can easily evade it if all operations are in crypto.

Bitcoin is a very good paying currency, but requires it to be much more, it needs to be more stable, pay more quickly

I think that bitcoin is a digital currency that has value and is a money order that has been spinning in trade.
The market has become a very lively exchange and a large community.

in my country I have never experienced obstacles to buying bitcoin and exchanging it as fiat money, the security option in the transaction is very safe because through various confirmations, the speed only takes a few minutes

I believe that the legal aspect is one of the reasons why Bitcoin is not easily accessible for everyone even after 7 to 9 years. In most of the countries, Bitcoin & cryptocurrencies are still in the grey area which is not preferred by the businesses to get involved with it in that sector and it restricts the growth in some way. However, legalization would definitely boost the ground level use of it and indirectly the accessibility for the end users.