They have a huge number of people that can specialize in many different things.

But their government has actually explained it. They purposely diversify any tech that doesn't have a clear winner, so in the long term a winner appears and they can focus on it.

They also, most importantly, don’t have to care if any of their reactors make economic sense. It is a single party state, and the incentive structure is very different.

most of chinese units are hualongs now