If this is not the biggest human right achievement during that 30 years I dont know what is. I also looked up data from world bank for India and Brazil and they albeit democracies seem less effective toward eliminating their proveties.
Do I want China becomes an even better place? yes. I emigrated but not my close relatives and friends and classmates. I miss them. Can China become a better place by pressure from western countries? I doubt it. It instead makes a great number of Chinese more anti-western.
What can make China a better place in my mind, is western countries showing what real democracy can do to make their own countries better. You bet all the Trump/Brexit/US healthcare/wars/drugs are not making ordinary Chinese more exciting embracing democracy.
Or maybe I'm wrong from the beginning that you are not interested in making China better with those discussions or criticisms.