I agree, FIAT will always be there because the government will keep their FIAT for payments that are officially recognized by the state. that's why some countries still can't accept bitcoin as a means of payment.
I also prefer to use USDT as an exchange for my crypto coins, because the calculation is easier. but for trading I use some coins that we can take advantage of, not necessarily with USD
In what you say, I think it would be convenient to differentiate what the state recognizes, what the state imposes and what the state does, in general terms. Where is the limit of printing money that raise inflation to levels almost never seen before?. That is what the state imposes, but not what benefits a country, and even if they try to “silence” it with digitalization, the underlying problem will continue to exist. As long as those who decide when, how much and how are always the same, the people will continue to suffer their abuses.