Gerrymandering is not done for the benefit of the citizens.
Of course it is not, it is done to benefit incumbency.
It is government power used as government wills.
Why would you think the government would do anything different with any greater power over the process?
For Most of human history the predominant focus of the government has been itself, a leavening of democracy makes it listen to the people .
Usually a good thing.
I can't favor any measures that improve incumbency , the advantage is already strong enough to hinder the operation of democracy.