This is already a theoretical risk with vote-by-mail systems, and in practice it is Not a Problem. Oregon has had vote-by-mail for more than two decades; there

This is already a theoretical risk with vote-by-mail systems, and in practice it is Not a Problem. Oregon has had vote-by-mail for more than two decades; there are present-day voters who were born after Oregon dropped polling places entirely. Vote coercion is not a concern, after 20 years of practical experience with the system. Neither is voter fraud (something like 54 fraudulent ballots cast, out of 2+ million, in 2016; the vast majority of those were people voting in Oregon and in another state.) The benefit, however, comes in the form of increased turnout; no need to rush to a polling place on a day that's very likely not a holiday for you. I wish everyone would switch to vote-by-mail the way Oregon does it.