Good idea ? Until you take a look at how not only congressional districts but even wards are cut up to serve a given politician at the expence of servicing the communities involved. Who then have to plead with two or three instead of one politician just to get a street repaired or a public facility built or repaired .What sounds like a good idea, ain’t, if they prevent that recourse.
Punting political power to unelected blackrobes is a time-honored way for legislators to avoid making the difficult decisions they are paid to make.