One aspect I've never thought about before is the selection of representatives for parliament/legislature. In the U.S., they're pre-selected in primary elections per party, but the national elections are single-winner per seat, so the candidates are out pandering to the voters constantly. I don't know percentages, but many other countries use multi-winner to select their national multi-seat bodies, and my understandi…
A voting system needs to be so simple that everyone understands and trusts it. Approval voting is a really simple replacement under the single-winner system that everyone can understand.