> For example Wayland supports far more than just “generic computer screen”. I’ve heard it was designed to be able to handle systems either multiple very different displays. Like maybe a normal screen and an e-paper display.

The other common example is that wayland is well-suited to AR/VR 3D compositing, and X... isn't.

> I remember reading an article that mentioned the mess of screens in current cars would actually fit Wayland well.

It had better be well suited to cars, seeing as how it was significantly made for and by car companies. (I hear, at least; I'm told that it was significantly pushed forward precisely by companies developing automotive displays)