All monetary systems are based on faith or force. Your meat world examples are valid enough, gotta eat something, especially in your doomsday scenarios. But the other use cases are still there, under the umbrella of web3. It's digital of course. When you look through them:
https://www.fiverr.com/gigs/web3 you see a lot of self-licking ice cream cones. Lots of web3 services for sale to help other people start their own web3 pump and dump services.
I find this stuff to be interesting but I haven't kept up.
Ok... Non-Doomsday... Was at Walmart buying groceries over the weekend... No option for BTC or any of the other Alt currencies...
Paid my electric bill... Same.
Car insurance? Huh... no BTC option.