A year and a half ago, shortly after the GNOME 45 release, I opened a pair of Pull Requests to deprecate and remove the X11 Session. A lot has happened since. The GNOME 48 release addressed all the remaining blocking issues, mainly accessibility regressions, but it was too late in the development cycle to drop...
This aged well lol
https://discourse.ubuntu.com/t/ubuntu-25-10-drops-support-for-gnome-on-xorg/62538
I know, right? Quite ironic that their own devs were going on about how unhappy they were with GDM dropping X11 session support.