As I mentioned, nvidia didn’t support Linux. That’s an objective fact, the kernel has an abstraction that allows managing buffers independently from the actual drivers. This was for a long time not supported by nvidia proprietary drivers, as they went their own way implementing a different abstraction.

Xorg was deemed a big enough target that nvidia hacked the driver so that it could be binary patched to make better use of their proprietary drivers, but that was never the proper way of the kernel.

Wayland has nothing to do with it, it builds on standard linux kernel systems.