It seems the more we discuss it, the eventual conclusion that emerges is that any act of subdividing representation (whether by geographical boundaries, demographics, or probably any criterion) inherently makes that representation less democratic under scrutiny. This is probably because any simplified/heuristic criterion will almost never be a perfect match to the specific type of representation an individual wants to prioritize, leading to mismatches between individuals and the defined criteria for “proportionate” representation.

So maybe the answer is broader elections with the voters themselves self-identifying the representation they want, and matching that to proportionally apportioned representatives? But I think we’ve just described political parties, so…I probably am not helping.