Easy to use is the main point here, reducing friction for completing a task is an art that not all interface designers do well.
You can see Sony put a lot of thought and love in their console's interface (same with the PS4), putting the user experience in the center, this is no small feat.
If you are not convinced, lookup smartphones from before the iPhone's release, many had all the features, including the touch screen... However with lackluster implementation, it's all moot. Same with the tablets, MS had touch screen support in windows since the early 2000s, it was just bolted on, and nobody cared for it.
What may be a game changer to one person is not necessarily a game changer to another. So, when you go all out and address everything that your customers ask for you end up with a lot of happy people. The controller people look to be pleased. The UI people are happy with the reveal. The noisy PS4 people are pleased with the cooling and fan. The, it’s all about games people, are covered day 1 and backwards and forwards. The technology people have the fastest SSD available anywhere. The surround sound and headphones people are getting a game-centric 3d audio system. I think the only people who are disappointed are the tiny form factor people but that doesn’t exist so may as well go big.