I believe the old excuse is OSS never has the money to hire someone. But considering Netflix is paying oodles to a senior UX designer and has ended up with what many hate (and for good reason), maybe UX really is just a harder problem than it is made out to be? Seeing how Firefox keeps leaning closer and closer to Chrome and how Windows managed to butcher usability with a hybrid interface, money does not appear to solve this problem.

At least with OSS we are free to alter the program to our liking. Not that we always could or should, but with Netflix not even that option exists, and Netflix is the paid option.