Crappy Design

I think, a big part of it is that people are now generally used to computers, so user interfaces don't have to be as intuitive anymore. A crappy interface won't directly affect your sales anymore, so corporations will naturally invest less money into it and may choose looks/branding over usability.

Having said that, that they took their perfectly fine icon implementation and made it worse, that necessarily involved an idiot in charge. A non-idiot would've just left it as-is, at no cost at all.