yea, but those users can still upgrade to 6.7 which isn't even out yet, and then also remain on that as a supported release for a significant amount of time.

And you'd have to balance all this against the wealth of severe X security bugs that have been coming out even just this week, and the maintenance burden of supporting it in a volunteer project with limited backing.

There's an argument that they are being too conservative. Other DEs like GNOME have already dropped X.