The issue in my mind is that this doesn’t seem to include any of the critical library functionality specific eg to NVIDIA cards, think reduction operations across threads in a warp and similar. Some of those don’t exist in all hardware architectures. We may get to a point where everything could be written in one language but actually leveraging the hardware correctly still requires a bunch of different implementations, ones for each target architecture.

The fact that different hardware has different features is a good thing.