In a multi party system when a party gets voted in with the promise of bringing some kind of change for the masses, more often than not they just get blocked by opposition. It’s just a way of maintaining the status quo.

You’ll find that people in capitalist countries cannot imagine a single party system being democratic. Their conception is based on two things mostly. First is that they cannot imagine being an agent in their governance. For them politics and the ruling party are things that exist in complete dissociation with their being. Second is that not only do they know nothing about China’s governance (also of other socialist experiments), they label them as undemocratic without doing any investigation.

It’s one of the many reasons that even in this day and age I cannot see electoralism as a way achieving socialism without establishing any form of dual power.