Okay, then maybe that local-first sync can easily support multiple schemes and let old versions run without overhead to devs?

Personally I'm fed up with syncing both as a user and as a developer.

As a developer, I don't want to deal with infrastructure for an app. It's a massive headache to have 24/7/365 responsive system. I want to make apps, not be on-call sysadmin.

As a user, I don't want to worry who is going to sell my data after going bankrupt. And I'd prefer small dev shops don't waste their time on keeping network infrastructure up and running with security patches.