It's also unique in its specifics. Voting is an unusual data-management challenge as we want a paper-trail (we want to be able to verify the correctness of the count), and voter anonymity (it must be impossible to prove that a specific person voted a specific way). We can do this robustly and easily with paper-based voting. Electronic systems are often deeply flawed.

Bruce Schneier's article on this: https://www.schneier.com/blog/archives/2018/04/securing_elec...