For example Ubuntu switched to using it by default a while back. Unfortunately since Wayland prevents the usual screen sharing in many popular communications applications from working I usually have to go back to X in order to do any real work remotely.
Combine that with some significant bugs that seem to happen in recent versions of Ubuntu/X but not Ubuntu/Wayland and now I have no fully working GUI on my Ubuntu machine because both options now have game-stopping problems.
I do understand that there are good reasons for Wayland wanting to do what it's doing and breaking the old-fashioned screen sharing is a consequence of those. I understand that applications should be updated and other packages should be used and so on. I hope that these issues can be fixed sooner rather than later and we can all benefit from the technical advantages of Wayland.
But if I'm in a conference call with important people about an important subject you can count the number of excuses I care about on the fingers of no hands. Wayland won't be ready for "normal" users until essential functionality works out of the box.