Earlier quoted context omitted.
X11 became really stable in the late 00s. And since the introduction of DRI3 it is at the same technological level of Wayland concerning the efficient buffer swap mechanism. X11 is however still miles ahead on the architectural level. Parts of the system like window managers or compositors can fail or be replaced at runtime without affecting running clients. Wayland lacks the appropriate standardized interfaces for t…
The choices of architecture seem to reflect different priorities, there are things that the Wayland architecture does better than X and vice versa, aren't there? Hard to say X11 is ahead architecturally if you pick features that Wayland may not consider important. I've seen commentary from people who have worked intimately on both protocols and implementations of both who consider Wayland to have the better architect…
For those interested in details: https://www.youtube.com/watch?v=GWQh_DmDLKQ