Earlier quoted context omitted.
It looks to me like there are quite a few more basic features fundamentally incompatible with Wayland's architecture than X's. Maybe X has issues but Wayland is still a regression.
That seems at odds with what the people who wrote both of them believe.
People have different requirements and I heard tons of stories of "this doesn't work, that doesn't work".
It's been slowly improving, but many people also just got burnt because of early hype. I don't remember any specific wayland problem in my personal recent history, but it took years to get there.