Can you tell me more? I visited Shenzhen few months ago and wasn't that astonished. Pretty normal city. Well, I was surprised about few things, like overall lack of traffic jams in the 17-million city, roads seems to be well planned, but I could just be lucky. And that's me coming from Kazakhstan, which is not exactly first-world country. Life seems kind of the same, taxi apps, map with reviews, delivery guys, etc.
Actually I'd argue that Chinese IT is slightly behind Kazakhstan, because their localization is so bad. Baidu maps does not provide English translation at all, and that seems the only proper maps for China. Most WeChat apps I tried also were Chinese-only. I'm pretty sure that every major website and application is well translated to English in my country, Chinese people seems to care very little about English, which makes it particularly hard for international visitors. I literally had to screenshot some app over and over, pasting it to Google Translate to be able to register in the some metro app, so I could actually buy tickets with app and not cash.
Also motorcycle people were absolutely crazy about road rules, like they don't care at all about anything. Auto road, pedestrian road, red light, opposite direction, anything works for them. I was seriously concerned about someone hitting me, which didn't happen, but few times it was close. Car people, on the opposite, were pretty disciplined. May be cameras don't work for motorcycles?