I am using i3 as a backup interface at work when I can't use stumpwm, and it is quite good to use with its default Debian / OpenSuSE config. Especially since it has very nice web docs.
Also, i3 and sway have probably best Integration of all the little stuff that one gets normally from the desktop environment: Audio control, mounting of flash drives, session management, lock screen....
What I don't like so much about i3 is its complex nesting of windows that comes along with auto-placement. Stumpwm is much more logical to me. Also has better configurability and superb documentation.

Yeah, i3 has no wayland support - that's why sway exists. It is probably almost on par but worse documented.
Apart from that, there is a reason that mayority of tiling WMs still run on X11: Wayland requires the WM to implement much more functionality by itself. That can be done by libraries but these are not yet as complete and mature as the X11 solutions.