The good thing that happened seems to be that China has essentially 10xed the Japan railways template. I wonder how bad a car centric China would've had been.
[1]https://en.wikipedia.org/wiki/Beijing%E2%80%93Tongzhou_Expre...
Compare China's urban areas to Asia's other major developing nations: Jakarta, Bangkok, Manila. China can do much better, but there's also much, much worse urban planning out there.