It always makes sense to leave a little slack when you are doing wiring. Once you cut a wire, it's hard to "glue" back together again. So why do I find this massive scale slack in wiring on a downtown street in Shanghai so amusing? It's entirely logical. No sooner do you add one hookup, you're going to need to add another. In the developed countries, we hide our anticipation. In China they flaunt it. "Hey, we are growing so fast, there's no need to tidy anything up!"