If you want to count productivity or expansion of borders or some positive statistic about Nazi government, there are many. But that is a largely different discussion. Note: I’m not implying Nazi rule to PRC, just trying to make a point.
I feel like you have an inherent bias of being Chinese and you want to see your home country improve and be proud of. That’s fair and a natural reaction. But your ideas and points are alarmingly irrational in my view. What you’re advocating is essentially justifying dystopian society that always, __always__ promises the good of the people. You should really read 1984 by George Orwell.
There is no such thing as a benevolent dictatorship or authoritarian government. When a man is given unlimited power, we are stupid monkeys that get an insane jolt by this “power trip” that’s its impossible to stay benevolent. Who is to say the next guy after Xi is going to be benevolent. Human nature and psychology is actually quite scary in certain situations (The Stanford Prison experiment, Milgram experiment).