I think that's more a thing of personal preference. Many developers (me included) consider working on UIs a chore compared to implemented new features. And sinc

I think that's more a thing of personal preference. Many developers (me included) consider working on UIs a chore compared to implemented new features. And since they are free to do whatever they want, they stick to the features. Commercial apps are usually pretty far from "unlimited funds". However, they know how important a good UI is for applications when you ask people to pay money for it, so they pay people to work on the UI and not on anything else. It's out of their hands, thus, it get's done.