I’d argue that no system truly works for larger groups.
more susceptible to corruption
I couldn’t disagree more. Any system is very susceptible to corruption. It’s all about accountability and transparency, which those in power will never make themselves do, because it is actively harming them by stripping them of opportunities to amass more power and influence.
And that is true in any system. Communist states became totalitarian dictatorships, while Capitalist nations also grow more corrupt because of greed and power lust, to the point where you see things like “the revolving door” in the USA, or the Tory party donors essentially paying for peerages in the UK. And of course, there’s also lobbying.
Corruption is everywhere and the common man gets screwed over regardless of the system or people in charge, because the good people are always too good to compete, fight, and play dirty against these politicians so the winners are always the evil ones.