I think you are right. Shenzhen is located in one of the wealthiest provinces in china, is less than an hour's train ride from Hong Kong, and is designated a special economic zone. That probably gives it several advantages over other Chinese cities.

I agree that it's not everywhere in China that's like that.

At least in Beijing and Shanghai you can find malls full of electronic shops. But nowhere near that scale anyway.

Also, there doesn't seem to be much of a maker scene here anyway from what I can see. Just a few spread individuals.