Quoted: Voting by mail may seem more convenient, but it also requires the voter to act much earlier than they would if they went to the polls, said Barry Burden, political science professor at the University of Wisconsin–Madison. You have to make sure to request your ballot early, and in some states, make sure you have a valid ID to do so.
“One problem with having a hard and fast election day deadline is that it actually forces people who want to vote by mail to submit their ballot before the campaign is over, and so it deprives them of the right to watch the campaign to its conclusion,” said Burden.