I've never used xwit before, but just looking at the description, I believe at least under sway the same should be achievable using sway's ipc protocol (I would

I've never used xwit before, but just looking at the description, I believe at least under sway the same should be achievable using sway's ipc protocol (I wouldn't be surprised if other compositors have similar options). I think the difference to xwit is that it does not work across windowmanagers/compositors, because much of what X11 used to do is now the job of the compositor, but I assume the users who script xwit likely also have a very tuned windowmanager, so it's unlike they switch window managers all the time and they could therefore just tune their environment for the same functionality as xwit.