This is a real problem as it intersects with race; a lot of civil rights advocacy in the 60s promoted racial district packing, so that sizeable African-American minorities could have their own representation. This is in the Voting Rights Act... kinda (https://fivethirtyeight.com/features/the-supreme-court-tackl...) In the long run, I think it's an argument for an unusual form of proportional representation.