[noxer]

You seem stuck in 2018. No one would use ETH to transfer $50 worth of money unless they already have that and the recipient wants ETH. But if you actually care about fees and speed you would not use ETH. (I wont shill any specific coin but there are plenty with Tx speed in the seconds and fractions of a penny fees.) And if you are actually worried about the price movements in the 3 seconds you could simply use a stable coin but realistically its only in your mind since "holding" a volatile asset for a few seconds is way less risky that holding a non-volatile asset for long time (which you likely do all day every day and dont even care about).

Needless to say that DEXes exist as well so you can exchange without using a "trusted" exchange. And CBDCs aka "gov stable coins" will come as well at which point the risk of holding it is exactly the same as holding paper money and less risk that holding fiat in your bank account because CBDCs would be a balance direly by the central bank so you avoid the traditional bank which could go bankrupt.

Just to be clear I dont think using crypt as a replacement for cash is a proper use case. Buying coffee with crypto and all that stuff is rather silly at least today.

I think crypto as a means for payment has its real use case in international transactions. There are millions of people who send money back home from all around the world and no traditional banking dependent service can even remotely compete with crypto. You can no use all the fast local apps that do not actually move any money just change balances between its own users.

Its only a matter of time before companies will use crypto for this as well if they deal with international payments. Crypto in this case will just be the bridge currency and its value or whether it goes up or down does not matter. I might send CAD and you get USD the exchange is done automatically from CAD to crypto to USD. You dont need a bank who takes a fee or gives a bad rate because this exchange can run over public DEX where everyone get the best rate aka the actual market rate. Nothing outside of crypto can do this. Every other solution has a middleman who sucks out a profit and make the system worse for everyone + is a risk especially if that middlemen is in another jurisdiction.