Are you under the impression that every person who expresses an opinion is obligated to justify it to some arbitrary bar? They are not. This person likes kde and presented some reasons why. That's it. Don't overthink it.
But yes, if I was going to write a full intricate review I would probably get exhausted and never post anything. Instead, I just wanted to highlight a few of the things that I found good (and yes, they're good from MY point of view), and I am glad this was enough to generate a good discussion.