Dual SIM came last year, and the 2000000:1 contrast ratio came in 2017. Aside from the third camera, the rest of these really are incremental improvements rather than new features.

I don't think that is a problem mind you. Lots of manufacturers are flinging shit at the wall trying to find the Next Big Thing(TM) in smartphones. I don't think it's going to happen any time soon. Smartphones in general have gotten incredibly good in the last 4-5 years.