That last bit is crucial: setting up a PC for gaming in the living room may not be that hard for someone who knows what they're doing, but for someone who doesn't, it looks impossibly complicated. The experience is also not nearly as streamlined or polished. Nobody wants to have to fuss with their system when their friends are over and they just want to play.

Just because something is easy for you or me doesn't mean it's easy for everyone, maybe not even most people