Linux

Which likely require very specific conditions to trigger and are not being actively exploited by anyone. "A potential issue exists" and "I have no issues (because my use case does not overlap with that potential issue and so the code involved is never called)" are not mutually exclusive. I've had no issues personally with X either, even though I know it has bugs—it's non-trivial software, so of course it does. Wayland does too. It's just that there are fewer people who get their jollies from pointing them out.

If Wayland works for you, go ahead and use it, but kindly don't spend your time calling out people who don't share your preferences. It's both offensive and tiresome.