Dave Airlie the guy who maintains the AMD drivers works for Red Hat, on xorg and wayland and the KMS that both use.
Not including xorg in RHEL doesn't prevent people from running xorg on rhel. The question is, why would you ? Red Hat is aiming at the server market and the cloud, not the desktop.
but if you ask for a bugfix on Xorg needing a large amount of time to spent on it probably not going to be worked on...