Well, that may be true with having to send the entire payload over a distance of space-time. However, if AI-based rendering could sufficiently predict the next

Well, that may be true with having to send the entire payload over a distance of space-time. However, if AI-based rendering could sufficiently predict the next frame, then you can just simulate the next frame without lag. Given it can predict enough frames in the future in relation to compute requirements, then all renders are local-only with "online synchronization" - at least, this will probably be how we do long-distance "calling" when we are a multi-solar system species; unless we find a way to break the speed of light limit. In a way everyone you talk to really would be a simulation; and they'd "sync" up to new data every so often for alignment.