We are likely speaking about minor movements, so that cluster bounds can be inflated and account for that during culling. Arbitrary WPO is unlikely to happen with Nanite, only relatively small motion.
As for tess, how about just mesh shaders? Tess is pretty dated and is becoming extinct. I’ve heard a lot of mentions that tess is very much need, but can anyone at least give an example of UE4 product, that makes best use of tessellation? While there might be, I don’t remember noticing it making visual impact in majority of recent UE games.