Wayland seems ready to me but the main problem that many programs are not configured / compiled to support it. Why is that? I know it's not easy as "Wayland support? Yes" (but in many cases adding a flag is enough but maybe it's not a perfect support). What am I missing? Even Blender says if it fails to use Wayland it will use X11.
When Wayland is detected, it is the preferred system, otherwise X11 will be used
Also XWayland has many limitations as X11 does.
I don't think kde plasma was the only one. Anyway, it just feels natural for xwayland to stop pushing for feature parody and for focus to switch over to Wayland after a while.
The biggest target for developers is the Ubuntu/Debian platform so their switch to Wayland should motivate other projects and paid applications to at least take notice.
New projects will try to support both but typically will focus more on Wayland. There's already an unintentional incentive to partially support xdg protocols Wayland relies on thanks to flatpak.