[ErroneousBosh]

Because everyone's going for Wayland, even though you still need XWayland to do anything useful on it because Wayland is comically incomplete.

[Gabrys1]

well, I mean, why can't this ship with an X server? Or maybe it does and then I'm not sure why it is said that only Haiku apps are supported

[numerio]

It's not that it can't, if you can do something it doesn't mean you should. If we used X it'd be another linux distro isn't it? Part of the fun is to make your own UI feel.