Since nvidia drivers do not properly implement implicit sync, this protocol not existing is the root cause of flickering with nvidia graphics on Wayland. This MR being merged means that Wayland might finally be usable with nvidia graphics with the next driver release.
EDIT: Nvidia dev posted that support is planned in the 555 driver, with beta release planned for May 15: https://github.com/NVIDIA/egl-wayland/pull/104#issuecomment-2010292221
Well, this is the root cause of this specific issue if you treat nvidia’s part of the stack as some barely changable black box (which is what it is right now). It’s not that I disagree open source drivers would be better, I just already own an nvidia GPU :/