It's not a matter of votes so much as veto power. CEV is the one where everybody, or at least their idealized version of themselves, gets a vote. In my plan, not everybody gets everything they want. The AI just says "I've thought it through, and this is how things are going to go," then provides complete and truthful answers to any legitimate question you care to ask. Anything you don't like about the plan, when investigated further, turns out to be either a misunderstanding on your part or a necessary consequence of some other feature that, once you think about it, is really more important.

Yes, most people historically have been morons. Are you saying that morons should have no rights, no opportunity for personal satisfaction or relevance to the larger world? Would you be happy with any AI that had equivalent degree of contempt for lesser beings?

There's no particular need to limit it to humans, it's just that humans have the most complicated requirements. If you want to add a few more orders of magnitude to the processing time and set aside a few planets just to make sure that everything macrobiotic has it's own little happy hunting ground, go ahead.