Good in theory, problematic in practice. A goal to strive towards but not achieve.

The main problem is that the dictatorship of the proletariat is so easily corrupted into a regular ol dictatorship. It's supposed to be a transitional period, but when that much power is in play, it's hard for people to give it up - and even when they're willing, they can just get ousted by less scrupulous people.

Making it safely through that passage is like a Great Filter of socio-economics