No. Mail-in voting works quite well and is super easy. We've had it in Colorado for years and I'd never go back.
Some time ago I made the case that all states should go to mail-in voting to avoid a terrorist/mass-shooting/truck attack on lines at the polls. The idea being that a large line of people standing to vote in the "wrong" district is a target for people who want to stop a few hundred votes. Do it at strategic polling places all over the state and you'd have mass chaos and a partisan result.
Since then, the case for mail-in has only gotten stronger. I find it unbelievably reprehensible and, dare I say, corrupt, that the republican party is trying to stop mail-in voting. What they're basically saying is that, in the middle of a pandemic, they would rather spread the disease and end up with more dead, than allow certain demographics to be
better represented and improve convenience to everyone.
As
@Joey D mentioned for Utah, in Colorado in order to steal someone's vote you'd have to get their ballot out of their mailbox
and have their signature. And then you'd still have a problem when they reported the lack of ballot (thus invalidating the fraudulent one). Honestly it's
far easier to steal a vote in a state that doesn't have a mail-in ballot.
You don't have to "mail" in your mail-in ballot either. In fact, I never do, since that would send it through the hands of many postal workers. I take my ballot and put it into one of many conveniently located ballot lockboxes that get emptied every day by election officials. The lockboxes are put up weeks before the election and available throughout.
Honestly the biggest problem with mail-in voting is that people do it too early, and then some new piece of news comes out and they wish they could change their vote.
Edit:
Apparently I have more to say on this subject. The other thing about mail-in voting that is amazing and fantastic is that you can research the issues right there with your ballot in hand at your computer. Need to know more about some obscure state proposition you didn't realize was on the ballot? Well you don't have to wing it in the voting booth. You can look it up right at your desk. I think it necessarily leads to better informed voting.