Actually they did occur, sometimes. I would not say "rampant" but did happen
Before "Al Gore invented the internet" I've spliced and run wires straight through the bulkhead, pickups seem to be more prone for the ammeter/ charging wires
I've replaced many TS switches which worked just fine -- except the brake lights didn't work
And a few other switches. Headlight, ignition, and heater, and often these could have been a connector failure as well as a switch failure --both showed heat damage. So which came first?
Lots of dimmer switches, but they are cheap, easy, and fast
