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Incidentally UE with 4.26+ (and more so 5, which is almost a complete cutover) switches from PhysX to their in-house solution of Chaos.

A lot of it has to do with determinism over the network IIUC.

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4.26 and 4.27 still use physx by default, and their chaos version is basically unusable[1] (because of bugs and performance). There is a 4.27-chaos branch which is more updated (maybe the same version as Ue5 chaos?) but I don't know how usable it is.

But yes the future for UE is chaos.

[1] to be fair fortnite used it, but clearly they optimized and fixed only the subset of features that fortnite uses.

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