I’m not saying democracy is a bad thing. But, it is important to understand flaws that are inherent to it. Long term problems are a particular weakness for democratic governments as there is almost no incentive to deal with them instead of short term “sugar high” projects.
I disagree with much of China’s strategy but the sort of moves being an autocracy allows enables it to simultaneously pursue a policy of economic growth while planning for the future. (You also get stuff lile the belt and road initiative, which was an incredibly ambitious program.)
Again, I am not saying China is better or democracy is bad. There are a BUNCH of huge flaws to autocratic governments like China’s. But, democracy is going to particularly struggle with these sorts of long term threats.