Let's understand that the legal framework of each country is very different. In any case, I do not see the relevance of an individual paying the fees with bitcoin, if he paying them in the local currency.

On the other hand, international transactions or goods and services that are acquired between countries as payments of these taxes can be interesting, since paying a nationalization tax requires an international agent, a local agent and that of the company involved, so operating costs increase.

A direct payment between those involved would eliminate all the bureaucracy that these old nationalization standards entail in terms of payments; in fact, it could contain the associated documents such as verification certificates and the paperwork that this entails in each transaction.

It is incredible that many processes are so slow and archaic, customs procedures, by land, sea and air, have improved in that they went to digitalization, but they did not leave behind the paperwork and stamps, things improve but they are still from the point From a systematic point of view, very Windows 98...

So, the usefulness of bitcoin as a blockchain goes beyond a simple payment, it has the addition of many things, but we have some "living" people wanting to take advantage of the network for stupid things. Hey, it's not with you OP, on the contrary, if that happens, fine, I mean things like "Memes."