Yes, it would be much easier, there would be no currency conversion where we lose money
Yeah, OK, tell that to those folks who bought Ethereum at $1000+ or BTC during ATH.
And don't forget about that (Japanese I think?) guy who wasn't allowed to enter USA because all he had was bitcoin wallet and not "hard cash".
BTW, ever heard about uro? You can travel between different countries without having to exchange your money.