It would be great to have something like this, but is it solvable in general (with arbitrary client)?

What if clients, say, always fetch only events with filter by kind? And then map them to specific places in app. Should this relay “mask” those messages with existing kinds?

What if clients only fetch by users relationships graph? Forge pubkey?

This seems only viable for specific clients (i.e. brands client) and I would question its viability