The most important feature of public elections is trust. Efficiency is one of the least important feature. When we moved away from paper voting with public oversight of counting to electronic voting we significantly deteriorated trust, we made it significantly easier for a hostile government to fake votes, all for marginal improvements in efficiency which don't actually matter. Moving to internet voting will further…
What if some level of efficiency (not necessarily internet) improves turnout and participation?
However, those are in the context of whatever political system they're in. No level of efficient election design is going to put a dent in the fact that California loves direct-elected downballot offices (e.g., treasurer, controller, insurance commissioner, state judges, local judges, etc.) and referenda, which all result in super long and complicated ballots with 50+ questions each.