It's about time they join the 30 other states who already require signature verification of mail-in ballots. Including my state of Arizona. This is one reason recounts take so long, when Republicans think recounts ought to be completed overnight. This is yet another reason why mail-in ballots are mostly secure and accurate in the US.
TL;DR: Most US states already do this. So I have no idea where your "Suck it up, Democrats!" is coming from.