I'll never make the claim that X11 is perfect, but my use case requires features that are either not built into Wayland yet or simply won't be built into it in the future.
I'm sure it's a fine product, but asking me to change my workflow to use it is a non-starter. When it reaches feature complete support of X11 functionality, I'll consider changing.
It's not that I have issues - it works just fine in the domain it's designed for. It's that the Wayland system does not provide feature parity with X11. I make extensive use of window manipulation using xdotool and wmctrl for my daily use case, and those are both unsupported on Wayland. It's a fine system for users whose use case fit with its design. It is not a feature complete replacement for X11.