Metal 3 fills in the gaps of incompatibility with Unreal 5's Nanite system. Apple and Epic should work together to bring this feature to Unreal for Mac.
Metal 3 and Unreal 5: Nanite
I agree. We need all these technologies to move the needle for 3d AR/VR and visionOS. I hope Apple and Unreal can just get along. Recent Unity pricing is unreal ;)