This map is going to be in the aftermath of a partisan decision by the Supreme Court (doubly so if they also mess with the ACA). The gloves will be off. I am absolutely incensed by the fact the Supreme Court would even think of getting rid of redistricting commissions so that AZ Republicans would have the right to gerrymander. I can only imagine how partisan Democrats feel. The new map would be drawn in an environment where the number one objective will be to F over Republicans, and all Democrats will be united behind that.
Also you say "it isn't done that way". Have you had a chance to look at the OH, PA and especially the NC map?
Strange that you assume it automatically has to be partisan. It can't possibly be based on, you know, the text of the Constitution.
If it also gives CA Dems the ability to gerrymander, wouldn't that make it biased in favor of Dems, anyway?