The big question is of course: The only really Bitcoin-friendly country so far is El Salvador, some other relatively friendly ones like Singapore aren't at the same level. Will the US for example join this club as Trump promised? What about European countries (Czech Republic for example)?
You are right because only El Salvador accepts bitcoin as a legal tender while most other countries only apply bitcoin as an investment asset so to smooth bitcoin as a legal tender like fiat currency may not be as easy as imagined.
Each country certainly has a different view on accepting bitcoin and generally they apply tax as an option to gain profit, regardless of how the tax is regulated.
My country does not provide access to purchases using bitcoin like using fiat currency and existing regulations will actually sanction anyone who violates it.
So the decision to accept bitcoin as an investment asset is still better for us for now than trying to fight the regulation.
My nation just allows exchanges, meaning that we do not really have any legal tender thing, but also it is not really helped if you allow crypto payments. This means, if I sell you one phone, and you pay me in bitcoin, but my phone is broken and you only realize that after you got it, you have no protection, and that's a big trouble. If you bought it with fiat, you would have the courts on your side and you would definitely try to get your money back.
This is why crypto is as far away from currency as it gets here, it is only an asset. But, it is okay to have an asset, they do protect that, as in if an exchange closes shop and runs away with your money, they do chase them, even caught some people who did that so I would say my nation sees it only as an investment, not as a currency.