Because we need advances in material sciences, optics etc to build anything new. Devices will stay the same until we invent new technologies. We've certainly

Because we need advances in material sciences, optics etc to build anything new. Devices will stay the same until we invent new technologies. We've certainly progressed semiconductors a lot, but it's still just the same old process for the most part. I think it's areas other than semiconductors that will drive innovation, new optics/displays (foldable, holographic, wide fov ar on a contact), solid state batteries, etc. Would sure be nice to have properly 3d semiconductors tho. As many transistors as there are across x and y, there should be across z too.