There will always be "provincial" places anywhere you go. Even in the western areas like Europe and USA, there are under developed places. I don't see it as good or bad.
But the thing with China, those "key cities" shows a rapid development from where they were 10 or 15 years ago. There is a "minor" city called YIWU that I visited this year. It got it's own new airport that opened early this year. That airport is more modern than our NAIA Terminal 2 and it's only meant to handle domestic flights.
There is another city (Xiamen) that I first visited 15 years ago. It had a few narrow concrete roads and other places had narrow asphalt or clay roads. The buildings were old traditional structures. This year, during a day's stopover visit, the city is more modern than Metro Manila. It has 4 to 8 lane roads through the city center with light traffic. It has a system of elevated roads for dedicated buses that run like our M.R.T. (and it costs less than our MRT to setup & operate too). It even has a SM Mall.
