Its own system? The entire local government was replaced with rubber stamp flunkies, all democracy activists were arrested, and it's basically a terror regime. No one in their right mind would move there or start a business there. If the intent was to maintain a separate system for the purpose of attracting foreign capital, so much for that.
The reports I’ve heard and read would be contrary to your claims. When I was in Hong Kong, for example, I saw huge protests, so I wouldn’t call it fine. Inside and out of Hong Kong, I’ve never met an HKer that was pleased about the China government’s plans. I also have heard that “its own system” is not a correct characterisation of the situation.