None of this matters unless only secret balloting is allowed. Mail in balloting is not secret. Only in-person balloting is secret. When a person has a mail i

None of this matters unless only secret balloting is allowed. Mail in balloting is not secret. Only in-person balloting is secret. When a person has a mail in ballot, they could be coerced or paid for their vote in an undetectable way. It might not even be the person who is authorized to vote, but someone else entirely - again completely undetectable. History has shown time and again that people are motivated to cheat at elections, so all ballots need to be cast in a controlled space that prevents these shenanigans. This is why the vast majority of OECD countries disallow or tightly limit mail in balloting.