I'd guess an LTS release x years from now would be a different story. Even next year possibly, based on the pace things are going lately.
Indeed, that's not a problem at all, because there are zero such things I care about. The problem is that a lot of distros and DE's are dropping support for X even though Wayland still isn't viable at all for so many people, and LTS isn't forever.
GNOME 49 will drop X11 sessions completely. That in turn means that the default editions of Ubuntu 25.10 and Fedora 43 drop X11 session support.
https://www.theregister.com/2025/06/12/ubuntu_2510_to_drop_x...
Arch will presumably pick up GNOME 49 as soon as it's released, and so GNOME on Arch will also drop X11 session support this (northern hemisphere) autumn.
I know that most Ubuntu users run LTS versions, but still, those are probably the 3 most widely-used Linux distros in the Western world, and as such, I think the statement that "very few" things is false where it applies to Linux distros.
99.99% of stuff should work under XWayland.