Try to talk with people who do that for work, I think you would be surprised. 
What does usability mean in the context of "do that for work"? If you are administrating command line + sh >> shitty "usable" mouse pointer installer with no silent option unless you reverse engineer it and implement it yourself. Arguably that argument is flawed since those often aren't native Linux programs but whatever.
For the average user, really, with modern Linux DE, what usability functions are those? Really curious.
(Arguably it is a stepstone for the average user to find out that he has to use Cinnamon or LXDE or burn in hell *cough*)
I personally prefer XFCE as environment because it's the most clean and best structured desktop environment ever (imho 
).
Linux has an image and perception problem, that's all really.
Most people don't even take the time to look at it once. They just grab on to the old stereotypes about it: only console wizards can use it, there is no support for anything, you have to be a geek to being able to properly use it and all those things.
Guess that is what you get for being Open-Source and released as a "text-adventure" in the beginning days ;)
I consider myself lucky to know at least part of the truth and enjoy my dual boot at home and work very much. I play on windows, I work on Linux. 
Well, I partly agreee. But I've still noticed problems between Linux -> Windows Portation. If you are writing Office Docs, would you rather use MS Office, or "Linux" Office, when you are not sure the formation matches (maybe they fixed it by now or maybe I could fix it myself with enough knowlege ... but MS Office does that for free when you can write it off taxes)?
