This is a BIG discussion in Brazil, where the election is basically 100% electronic, no paper involved. There's a large portion of the population that distrusts the electronic voting machines, partly due to rightwing propaganda, but partly due to a genuine distrust of a system they can't understand.

In person paper voting, however, only works on a relatively healthy democractic community. What used to happen around here was that whoever was the local hegemonic power, mostly oligarcs, sometimes gangs, would just plant a grunt in the voting halls and coerce people to reveal their votes. That or they would simply have a bag of pre-cast votes and drop them all in the ballot box. Lots of absentees and dead people used to happily cast votes at the time.

So ultimately the full electronic system has been working quite well over here for the past 30-something years. It has only really started to be aggressively questioned since 2016 with the rise of social-media as an election driving powerhouse.