But the issue is those things are nice to have, whereas X is baked into existing workflows that either do not work on wayland, or only work on a subset of compo

But the issue is those things are nice to have, whereas X is baked into existing workflows that either do not work on wayland, or only work on a subset of compositors (due to philosophical disagreements), and many of these workflows have been around for a while, and there is no desire (or funding, or time) to change them.