Yeah I mean you are preaching to the choir there. I picked up a used 3090 because rocm on the 7900 was in such a poor state.
That being said, much of what you describe is just software obstinacy. AMD (for example) has had hardware encoding since early 2012, with the 7970. Intel quicksync has long been a standard on laptops. It’s just a few stupid propriety bits that never bothered to support it.
CUDA is indeed extremely entrenched in some areas, like anything involving PyTorch or Blender’s engines. But there’s no reason (say) Plex shouldn’t support AMD, or older editing programs that use OpenGL anyway.