If you look at these US high-tech consumer products, many companies started out much “simpler”. GoPro was a disposable film camera and a wrist-strap, and iteratively got to where it is today. The iPod came out much before the iPhone. As you say, the R&D is a hard sell when you have to go from 0 product to a fully featured state-of-the-art. Somehow, these Chinese companies can spend years copying and then once locked in go on a new-features blitz.