[shark_laser]

This is not true. Read up on the outbox model. I have linked it elsewhere in replies in this thread.

You post to your own preferred relays, as well as to the preferred relays of others who are involved in the conversation, as well as to a couple of global relays for easy discoverability.

These global relays are useful, but are interchangeable and totally replaceable. As soon as you've connected with someone you can retrieve their updates, because you know their preferred relays, and can query them directly.

[treyd]

That's exactly what I'm talking about with having pre-agreed relays. Those relays become preferred as a sticky default, especially with low-sophistication users that don't have organic onboarding paths away from the sticky defaults.