Theoretically couldn’t you send each client its data after performing occlusion culling based on each one’s camera?

Don’t some competitive games more or less already do this? Not sending player A’s position to player B if the server determines player A is occluded from player B?

I seem to recall a blog post about Apex Legenda dealing with the issue of “leaker’s advantage” due to this type of culling, unless I’m just totally misremembering the subject.

Regardless, seems like it would work just fine even in 3D for the types of games where everyone has the same view more or less.