Collaborative interoperability is larping, the only interoperability that is worth anything is opportunistic interoprrability (or flat out reverse engineering) to steal other clients market share. That works most clearly with Files because they escape the incumbents walled garden. The goal is keeping all data on user controlled data stores, and the rest will come naturally from ruthless competition. Just reserve the decline of the web and rise of private databases. Protocols and Improvement proposals don't socially scale, the entire web can't sit down and discuss how to shape every type of data and every client behaviour. And that is OK.

It bothers me when a social media app doesn't allow me to override users profile pictures, this is my phone god damn it.

I want to make pubky so good that no indiehacker can be bothered setting up a backend to validate an idea. They would tell early adoptors; Just sign in with your pubky and come with your own backend, and that wouldn't be too much to ask. Maybe even attractive to users who know that their data won't disappear if the developer got distracted by another side project.

There are around 1000 known PDSs in AtProto, how many Outbox relay are there in Nostr?