Who is to say that the central planner must be the ontological equal of a single unit? Why not a more complex system?
You could have for example a quorum of single-unit who will need to reach a consensus concerning their diverging self-beneficial impetus. You can also imagine, if you represent the interest of each single unit as a vector in some kind of space, that the quorum must navigate a product of those vectors.
You can imagine an AI then, a machine exploring that vector space that could learn to balance the wants and needs of its single units.
Et cætera. I don't know exactly why you comment was not well received, I am not able myself to downvote comments here and I did not do that, but my own opinion about yours was that it was basing itself on some assumptions that were biased by some real-world considerations that were irrelevant for the concept presented.