I understand exactly how you feel. If you are as competent as you sound, find a new job and then leave. Make sure the new place is more stable, so you can keep your conscience clear. BTW, +1 for having one.
I have also found that people who think everyone should be leaders generally aren't and don't understand leadership at all. Typically, they are egotistical and lord over others for their own gratification.
Remember, when you interview, you are also assessing a potential employer. If they ask you stupid questions or make demeaning remarks during an interview, that is your cue to move on.
"But still guys, it's pretty 80s"
Seriously? I've seen more creativity from the 1880's. B.C.
"Einstein said "As simple as possible, but no simpler". Notice how there are two parts to that sentence. The Gnome 3 crew designed by the first part of it only."
You nailed it right there. Fortunately, with Ubuntu 12.04 and some stable extensions, I find it possible to get past that. But I cannot conceive of a reason to take away the ability to do basic configuration.
I've met a lot of egotistical developers in my time, but I've never seen any so insensitive to feedback. The forums have been flooded with feedback, a lot of it constructive, from the start. It's almost as if, in some sort of Dilbert world, the Gnome team decided they hated everyone who was using their work and wanted them all to go away.