I think a lot of that is economies of scale. The parts needed are not cheap in small quantities, but we finally got to the point that they are popular enough that they are made en masse.

Yeah at the top end there is still a ton of progress, but on bottom end it just recently turned into commodity, to the point they are sold in more general stores.

The bottom end are still incredibly impressive. For $200 you can buy something that just five years ago would have made for good science fiction.