Xorg, or X11, “used to” do the “minimum necessary” for a remote display system… in the 80s. Graphics tech has changed A LOT in the last 40 years, with most of the stuff getting offloaded to GPUs, so the whole X11 protocol became more and more bloated as it kept getting new and optional features without dropping backwards compatibility.
The point against Wayland, was dropping support for remote displays, while kind of having an existential crysis for several years during which it didn’t know what it wanted to become. Hopefully that’s clear now.
OpenRC and runit are indeed working alternatives, but OpenRC is kind of a hack over init.rd, while runit relies a bit too much on storing all its status in the filesystem. Systemd has a cleaner approach and a more flexible service configuration.