[Valmar]

A pity that the Mir devs didn't really have any experience or deep knowledge of the Linux graphics stack...

It took the X11 devs, many of whom were also involved in Mesa and Linux graphics development, literally years just to get all of the necessary plumbing in place in order to replace what X11 was previously doing.

These developments help not only X11 or Wayland, but make the development of a newer, superior protocol to X11 and Wayland much easier, because the hard yards have been done for them.

It also makes it easier for those who might want to transition from Wayland to a hypothetical superior protocol.