This would disenfranchise many disabled and those who must travel for work.
My grandmother passed a few months ago, after a nearly year-long illness that left her bed-bound. There was no way she was getting in the car, load her into a wheelchair or gurney or something, then sit in a queue, in the middle of a pandemic, to vote. But she sure as hell was able to exercise her civil rights at home.
So somebody like her would have a very valid excuse to vote my mail (and could send it via FedEx or ups), but an able bodied person should walk to the polling place, show their ID, and vote. You get 4 hours off by law to vote