Those competent and talented people also managed to make extremely bad choices at every turn, and seem ideologically opposed to the idea of customization, resulting in an environment that is fundamentally painful to use unless you very specifically fit the box of what they expect users to be like.
There's nothing wrong with not providing customization. There's a perfectly decent customizable DE in KDE, anyone that wants to tinker can use that.
I don't want to tinker. I want something to just work, and not have too many knobs. Gnome fills this need perfectly. Thus, you saying that they made bad choices at every turn seems rather idiotic.