> What we need is a system that allows people to easily create new IDs, that updates contacts that people choose.

> Contacts would need to be always online.

That also sounds impractical.

> It's a required ID to use the internet

How does any of that follow? Having a reusable self-sovereign ID format for those scenarios where people want to share it is very different from having an authority-issued ID format that's mandatory for some interaction.

As a concrete example: I have an iMessage (CKV), Signal, WhatsApp, and GPG identity key, but I don't need to provide any of them when ordering pizza online. But what I can't do is choosing to use the same key for my same number on both e.g. Signal and iMessage to make it easier for people to switch between messengers without having to re-verify me.

A hypothetical shared key format would fix that, but would (hopefully!) still allow me to create multiple keys/identities for multiple contexts, and to not provide any persistent identity when it's not necessary.