That's not what they're asking for. They want to be able to distribute humans and superhumans evenly (and I do too). It's not about what's "most optimal" according to your metrics.
It's closer to compulsion, at least for me. It's like having a line of pencils and you have to make them all line up rather than haphazardly strewn across the desk. Or like alphabetizing a physical media collection. It scratches a particular itch for me to have all of my workers' numbers even, or at least as close as I can make them. For what it's worth, I'm referring to distributing Humans and SuperHumans, not whatever the factories are doing.