The challenge here is that too many people will assume it did it right and not verify. That creates an attack vector. That creates another thing for people to y

The challenge here is that too many people will assume it did it right and not verify. That creates an attack vector. That creates another thing for people to yell fraud about. With paper, there can be no bait and switch, you physically have to press pencil to paper. As far as the "people don't color the circles correctly", the counter machine can kick that back and say "unclear scan, please verify all circles are colored correctly" and not count that ballot.