I agree that cryptocurrencies and superstitious fiat currencies have their own niches for use, where each of them has competitive advantages. It is also impossible to consider all cryptocurrencies as having a single function. So bitcoin and ether are not very suitable for micropayments, but for example, Tron or CHIA, on the contrary.
Bitcoin is still suitable for small payments, there's the lightning network and even if you use bitcoin, the fees are not that really high this time.
That's why El Salvador has adopted it as a legal tender and they're seeing the good side of it not just as a payment but as well as a store of value.