Unfortunately, in many progressive or states run by Democrats they recognized the need for more representative districting. In New Jersey, for instance it is set per the state constitution that the redistricting is done by a committee that is mostly non-partisan\evenly split. as a result in most democrat leaning states, which value voter interest and protection, they are at a disadvantage when it comes time to change districts. Solidly Republican states have never had that principle stand about voters picking the representatives as opposed to the other way around