Yes, I often feel that proposed optimal solutions disregard the feeble nature of the human mind. Solving obesity is a trivial program, just control your food intake. One-step-algorithm. Trivial, that is, unless you're a human, in which case it's practically infeasable for most.

Ignoring our human, ahem, let's call them "quirks", when devising solutions is a classic failure mode which transforms supposedly "optimal" solutions into suboptimal or even actively harmful ones. I'd cite socialism as an example, but I just got out of that rabbit hole like 5 comments ago and have no desire to leave Kansas for now (metaphorically speaking).