It’s very nice to not have a dozen different versions of the same distro to parse through and figure out that are simply the same distro with a different DE. Moreover, very few of them offer this many options.
Cachy could be doing a better job explaining what the user is looking at here and who each of these is for. Pretty easy to sum up in 1-2 sentences…
i think that’s calamares, so any distro that uses it can technically do this. the reason most don’t is that you can just add more DE’s after install. i know endeavourOS and openSUSE do this, and i think fedora has something like this too?
but the main reason is to keep install size to a minimum. if you want your system to be installable without an internet connection you can’t just ship every DE known to man.