As much as I agree with you in theory, my own experience with democratic centralist organizations has shown minorities on particular issues can be shown the door quickly without debate even when a full floor democratic decision had not been made prior, and even when both sides are supporting the existing party line.

Power absolutely does corrupt, even when the amount of power wielded is irrelevant, just look at how far towards neoliberalism Vietnam has gone, look at how the USSR was even able to fail as it did. The only good features of modern liberal democracy is a very powerful and politically independent judiciary, the lacks of checks and balances to reenforce a socialist vision has absolutely contributed to the failures of past socialist projects.