Why would we want to blast what we are up to into the ether without any way of ever deleting it?

Nostr really is terrible as a social network. It just seems super duper dangerous.

Say anything nasty here, then your country suddenly turns into a authoritarian shithole, like the UK, Germany and France, and you get raided and thrown in jail for wrongthink.

Try to be anonymous or pseudonymous? Good look keeping that up for a year without ever accidentally posting something that doxxes your entire identity.