There's also trade off where the more tamper resistant/evident the system is, the more sophisticated it must be and the harder it is to understand the system.

There's also trade off where the more tamper resistant/evident the system is, the more sophisticated it must be and the harder it is to understand the system. Trust isn't just about engineering like it is for avionics or other high-reliability systems. It's also about independent verification, including by lay people. If it requires advanced cryptography or computer science knowledge to trust the election results. I live in Canada where we do paper ballots everywhere. We also get same-night results on election day. They're just starting to experiment with vote tabulators, and this means that results come in faster now. In fact, in the latest Ontario provincial elections they had a declared winner 20 minutes after polls closed. Especially with tabulator machines I just don't get the point of electronic voting.