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...
The reason most distros don't do this is because they usually try to steer users to their preferred desktop. I don't mean that in a bad way, but often they call it the flagship edition. This is usually the desktop environment that they develop and test. Think Linux Mint with Cinnamon, popOS with Cosmic, Zorin, etc. Pretty much every other distro that has options do exactly what you are showing through the use of the venerable calamares installer that you see in your screenshot.