We only use machine generated ballots at our polling places in California, or at in least in LA County.
When you get to the polling place, your identity is verified, and your given a blank ballot. You then put that ballot into the voting machine, and select the candidates (or yes/no answer) you want for each election. Then machine then prints out the ballot so you can view it over and make sure it’s correct. You then re-insert the ballot into the machine, and push a button to cast it.
Nothing about that process seemed worrying, questionable, or concerning when I cast my ballot. I felt pretty confident that my vote would be counted as I had cast it, and the process was relatively quick and easy. I filled out a paper ballot in 2018, and I much preferred using the machines in 2020. Our mail ballots are paper ballots though, so if people still prefer paper ballots they can use their mail ballot.