The thing lefties (and righties too) forget about Gerrymandering is: sure you can rig it for a few extra seats, but you create "fortresses" for the other side too. So stacked with their voters they will never flip. Meanwhile the "rigged" areas will remain purple at best & could flip in just a decade, requiring regular "jigging" :/ It gets really flagrant after a while, like a lot of Blue cities & states. Some Red ones too.

Enforced segregation is one way to keep districts "stable".