“Public confidence” is exactly my point though. The villains here are the bad-faith actors eroding public confidence, not the totally normal election procedures. There is no reason taking a week to count votes is a problem by itself!
But they take even longer in general elections! Republican conspiracism aside, it is just better for public confidence in the democratic process to have vote counts done efficiently. And it’s not a matter of Election Day postmarking, which plenty of states have - it’s a fixable resourcing issue.