Your entire argument is about the promise of blockchain and not the actual current applications people are using. Your argument is theoretical when OP is asking for practical use cases. You mention many hypotheticals but not a single "I use blockchain for X" or "my mother uses blockchain for X" which is what actually matters.
> While I won't talk about the idealized vision of blockchains
As far as I'm concerned that's all you talked about, and you don't even realize it.