There's a fair argument there. In this digital age, signatures are increasingly ill-practiced and unreliable. Signatures as proof of identity were standardized as a practice before the industrial age, much less the digital age, and while they aren't useless, they have not kept up well.
I would absolutely support requiring that for Absentee Ballots, the relevant electoral office be required to notify you promptly that a sealed vote envelope with your name and signature on it has been received, and whether or not it's been accepted. This both helps prevent the vote from being discarded because of the issues with signatures, and lets you alert the office if you have not in fact sent such a ballot in, and that someone is attempting fraud in your name.
Of course, given how useful such a measure would be for preventing fraud, the DNC will fight such a thing tooth and claw.