Machines have a higher chance of not working on election day and any issues will lead to people having to wait longer or not being able to vote at all. Which y

Machines have a higher chance of not working on election day and any issues will lead to people having to wait longer or not being able to vote at all. Which you can already see happening in areas where voting machines are used. This is especially problematic if specific regions with known political majorities can be targeted and sabotaged. There is absolutely no reason to not just use a hole puncher or an overhauled ballot design. Even just keeping the problems that exist with paper ballots beats any risk that introducing electronics in the process pose.