Being a democracy didn't stop the US from killing Guatemalans over the possibility of bananas costing a couple more cents, or installing or supporting dictatorships in foreign countries when it benefited them. How much power do voters really have in determining foreign policy or large financial decisions?
It is also not quite right to treat the Chinese government as a single minded monolith in determining their own policies. There is tons of internal factions and divisions within their own political system. Yeah sure certainly Xi has a lot of power, but only so long as he doesn't try to buck off the opinions and ideals over the rest of their political class, a political class who holds many of the same opinions and ideas as the US political class. The political sphere in China today is nothing near what it was 50 years ago.
It is also not quite right to treat the Chinese government as a single minded monolith in determining their own policies. There is tons of internal factions and divisions within their own political system. Yeah sure certainly Xi has a lot of power, but only so long as he doesn't try to buck off the opinions and ideals over the rest of their political class, a political class who holds many of the same opinions and ideas as the US political class. The political sphere in China today is nothing near what it was 50 years ago.