And before bell bottom jeans, there were straight bottom jeans. We actually went backwards. Bell bottoms were a type of flare, an embellishment on a Plain Jane design, and a fad. For people who liked bell bottoms, going back to straight bottoms was regression to being boring. 3D is also a flare and an embellishment on a Plain Jane design. Maybe 3D was a fad, too.
I'm not going to argue taste with you, just stop with the "DOS was flat" argument, its a non-starter.