[pantalaimon]

There are no problems with running Vulkan applications on X11.

You must confuse something here - wlroots recently got a Vulkan backend, meaning you can run it on top of Vulkan API.

It has nothing to do with what Graphics API the clients will use.

[Seirdy]

I was referring to the fact that OpenGL is becoming a second class citizen among the silicon giants, with more attention being drawn to Vulcan/Metal/etc. Now that sway supports a Vulcan backend, it won't be left in the dust stuck on OpenGL.

I'm not aware of GNOME or KDE having similar improvements on their X backends or the same happening for X WMs.

[vidarh]

X WMs do not have anything to do with rendering. The conflation of the server/compositor with the window management is a Wayland thing, and one of the big regressions in flexibility that current Wayland compositors bring. You may be confusing X WMs with the X server or with the toolkits rendering backends.