[Author here]
Regarding...
> "Professionalism" != "Anal-retentive control freakery"
I think you misread or misunderstand me.
I am talking *ONLY* about themes here. Skins or whatever you prefer to call them.
What this sentence means is: I don't download or apply or customise or tweak or otherwise mess around WITH THEMES. I tend to leave them on default. What that, in turn, means is that I don't really much care about themes and skins, so long as they aren't actively ugly.
KDE's are usually actively ugly and its themes are one of the things that puts me off KDE.
I do not like or use GNOME and only run it for testing purposes. I find it crippled and very confining as a desktop. But it *looks* great. Lovely plumage.
Outside of Unity I usually use Xfce. I often read complaint that it looks boring or dull or old-fashioned. I don't care.
Themes for me should be like incidental and soundtrack music in a film: if you notice it, it's bad. It should amplify emotion and set tone and if you consciously register it then the composer has failed. Source: a friend of mine, David Julyan, a soundtrack composer who worked a lot with Christopher Nolan.
I mention GNOME's looks because I do not like the functionality.
I mention KDE's because they distract me with their horrid jarring mix of RANDOMLY big BOLD _black_ fonts *WHICH* serve _no_ apparent purpose, combined with silly cartoonish icons at random, sometimes animé themed and sometimes not, something dull and grey and then SUDDENLY SCREAMING IN YOUR FACE IN TECHNOCOLOUR.
Oh, and two Help/About boxes, unrelated, and, you know, 5 start menus and 3 taskbar button tools and 76 options to tweak in 42 dialog boxes, but no, you can't have a panel spanning 2 screens, we took that out.
Don't misconstrue me. I am trying to be polite and positive about GNOME because lots of people use it. That doesn't mean I like it. Instead you need to think about why I feel the need to call out something relatively minor like wallpapers.