X11 is fine. It's mostly just Video Games that need an alternative. It'd be nice if there was a "pause X11 video card control and give exclusive access to a single application." Then there's no need to care.

You just described X11's DRI (direct rendering infrastructure).

https://en.m.wikipedia.org/wiki/Direct_Rendering_Infrastruct...

This actually doesn’t work with modern expectations.

Modern games are expected to work in multi-monitor setups and render in “borderless windowed” mode, so you can alt-tab out to multitask, or have a comms overlay. Single monitor single process gaming still happens, but a good 85% of setups (according to the Steam Hardware Survey) are not that. There are five games I know or that actually handle multimonitor natively of the hundreds I’ve played. So we need some form of cooperative multitasking for graphics with the window manager.

X11 is utterly broken for multi-monitor setups with different resolutions at different scales (e. g. builtin laptop screen @1.25x, external display at 1x or some variation of that). With high resolution screens (e g. 4k at only 27"), that setup is not uncommon anymore.

(Wayland is broken in very many other ways, though, so you trade one evil for... 5 others).