Except it’s also much slower than PhysX in scene queries, both updating the scene and querying it. Fun, right? Besides, a fortnite specialized thing is not acceptable as a general purpose physics engine, which is what a general purpose game engine should provide.
Physics replication could be made with PhysX just fine if only they tried. But they’d rather pretend it’s impossible to modify PhysX. The only point you have here is the 64 bit support - though I wonder if PhysX 5.1 will do something there too…