More-over, I don't think parent is giving enough credit to certain types of computer scientists and certain companies. Facebook, Google, and some game companie

More-over, I don't think parent is giving enough credit to certain types of computer scientists and certain companies. Facebook, Google, and some game companies definitely do hire lots of human-computer interaction Ph.D.s who definitely are trained in exactly this sort of thing. There's a reason the title is "computer science researches" and not "computer programmers".