"Works" has always been hotely constested, the problem I always ran into is the wayland and X treat have only 1 composite or what ever space, it then attempts to carve it up, so when you have odd sized and monitors that are not in a perfect square you end up with problems

for example in the image there are 2 monitors above the laptop with the laptop being a 3rd screen, assuming they are all 1080p, x/wayland sees that as 3840 x 2160, then in effect attemts to block out 540 px on either side of the lower monitor, that only works sometimes

Then the shit really hits the fan when you go to play a game, windows is always very good about going full screen only on the primary monitor. X Wayland, I have no idea how it chooses were to go,

also placing things gets really weird if you monitors are out of order, as 0x0 coordinate may not be where you think it is...

There is just 1000 little things that deep in the core of X that were carried over in Wayland that makes multimonitor support poor in Linux, and I dont think it will ever change.

That's true of X, that's not true of Wayland. In fact that is one of the fundamental limitations of Xorg that drove the development of Wayland in the first place.

I'm not sure if the issue you're having is with the compatibility layer or the desktop environment support or what, but Wayland shouldn't have that issue and your experience doesn't match mine.