Look at Asahi. Almost a decade in and we can use the GPU at like 30% of its ability on 6 year old hardware.
That a project with major interest. No one cares about spending a decade reverse engineering the hardware on a Google Pixel or Samsung Galaxy.
If they gave us proper full hardware documentation, we could create high quality alternatives. Again, we can't so you don't see it.
Competition is good. We should always advocate for things that enable competition.