This discussion is another in a long line of examples of unprincipled politicians using principled arguments to pretend that they give a shit about you.
Just like Ds and Rs don't give a crap about whether a vote is legal, fair, or unburdened - only that the vote is for them - when they argue voter ID or felons voting...
Any thought that politicians actually care about principles regarding the census, reapportionment or redistricting is laughable. Rs want more seats in areas where their voters are and Ds want the opposite.
It is as simple as that.
If mail in voting overwhelmingly favored Rs over Ds, their positions would flip instantly and they would pretend they always believed that way and that only an amoral idiot would possibly argue against their positions.
And their mindless flacks would eat it up and follow right along...
One needs only remember the past lawsuits on redistricting, and follow along in the coming new redistricting lawsuits as Ds and Rs in one state argue exactly opposite positions of their counterparts in different states depending on how redistricting affects them.