It’s irrelevant that every distro supports every DE. The out of box experience matters a lot, you don’t want to force a beginner straight into the terminal just to get a UI they like.

For recommendations to experienced users, I agree.

That site looks like it’s closed source. FOSS projects tend to not be well designed in the frontend except the occasional gem. Not sure why it’s such a pattern, considering this project isn’t making much money and it’s made by a single dev.