That seems like a False Dilemma there is no technical or logical reason to assume that anything other than geographic would mean you are assigned a seat at birt

That seems like a False Dilemma there is no technical or logical reason to assume that anything other than geographic would mean you are assigned a seat at birth that would follow you for ever with no ability to "move" to a different seat. Also my comment does not say to forego all geographic basis but more so questioning the idea that we need continuous geographic zones. Maybe 3 counties in Iowa and 3 counties in Texas, and 3 counties in Montana all want for form a new zone....