In addition to what others have already mentioned, https://access.redhat.com/documentation/en-us/red_hat_enterp... says "The X.org display server is deprecated, and will be removed in a future major RHEL release."

prolly referring to https://www.phoronix.com/news/Fedora-40-Eyes-No-X11-Session

the new cosmic DE doesnt support x11 at all. Fedora KDE SIG plans to not offer the x11 session in the session chooser.