I actually disagree with you on a few points.
Point 1, the Chinese government blocked those sites not to protect local businesses. They are trying the best prevent the Chinese people knowing the truth so they will continue rule this country. You had known it if you have ever talked to any people other than the (state-owned) entrepreneurs.
Point 2, can you define high-end user here? To my best knowledge the official / rich people buy iPhone but they hardly know anything about iPhone. They use iPhone to make calls only. Some poor fellows even sell kidney to buy an iOS device just to show off to others. Basically iPhone shows your social status in China.
Point 3, not every iPhone was jailbroken. Those do jailboken their iOS devices simply do not want to pay for apps. It must have seen weird to you guys that people pay a lot for a phone yet not willing to buy apps, but that is true.
Point 4, I second you.
Point 5, not every netizens know the existence of the firewall. Many only use baidu.com
and QQ, that's what the internet means for them.
Point 6. That's right, 3G now is popularized. And I do not think every US cell phone owners uses 4G.
Point 8, actually you can download those map data using WiFi. I store offline maps not because of the pricing plans, 3G connection eats up your power quickly.
I have no idea about how long you stayed in China, but I am impressed with what you learned. Next time when you come to China, don't just meet the officials and entrepreneurs, also have more discussions with the grass roots, just my two cents.