In my experience, when you ask people to do approval voting, they seem to rank the candidates then try to figure out where to put the cutoff between the approva

In my experience, when you ask people to do approval voting, they seem to rank the candidates then try to figure out where to put the cutoff between the approvable candidates and non. The system doesn't give any guidelines on where the cutoff goes, so people recoil because they feel like they're doing it wrong. The fact that people can set arbitrary cutoffs and it'll work out in aggregate is pretty surprising.