Along with class sorting, geographic sorting is a gigantic problem, in my opinion, because it means we don't have a two-party system in most places. We have two separate one party systems in most of the country. So instead of competing to to the middle, we're competing to the extremes, since in one part control you always have to out compete the other guy on purity and loyalty. Denunciations await for non-conformers. You see that hugely in the Trump controlled red areas, but increasingly among the woke set, too. For all the flak that people throw about a two party system, in theory it's supposed to be a moderating influence. by contrast, one party systems are always self-reinforcing in the worst way. I'm not sure how you roll back that trend. My hope was that Trump would make the GOP implode, the democrats would take over everything and then split in two to rebuild the middle. Clearly that was a pipe dream.