The trust model for elections is fundamentally a human one: the hundreds of thousands of American volunteers (mostly senior citizens) operating via transparency

The trust model for elections is fundamentally a human one: the hundreds of thousands of American volunteers (mostly senior citizens) operating via transparency, norms, and good faith. All the tech in the world, even the most solid FOSS crypto, couldn't fix it if the process were corrupted at the human level. The best reason to use pen and paper is to ensure that the process is auditable and legible to the most number of regular citizens, not only for security and integrity, but for perception and public trust, which are arguably the most important backbones of democracy. (We may have low confidence in some aspects of our system, like gerrymandering and voter roll purges, but we almost take for granted that once one is in the booth, there's a high reliability that one's vote will be counted correctly.)