you're arguing against a straw man. I don't think anyone (at least not many people) are looking for a capped reward system or one-man-one-vote or any other way to share the vote or the reward pool equally.
What many people do believe is needed (and the big reason for the exodus away from steem) is more parity between whales who got their SP mostly from a closed premine (call it what you want... ninja mine, premine, awesome thing X, whatever, the effect is still the same, that very few people got most of the initial SP) the intention of which was to circumvent the legal requirements for a crypto release.
That isnt communism, thats an open market. That is to say, one where the level of influence accurately reflects the level of investment. One, where people can actually buy enough SP to make a difference. WHat we have now is a command economy, much like what they had in the soviet sattelite states prior to the fall of the berlin wall.
Yes, small-ball commerce is possible to an extent, but for the most part real economic control rests with the party elite.
Its a game that the soviets found that most people didn't want to play. Absent a significant change, i suspect that its also a game that the creators of steem will have a lot of trouble finding players for.
It may not be your preferred argument, but I have seen people make precisely these arguments (capped rewards and one vote per user).