I don't know how you've come to the conclusion that's a reasonable solution. Wiring harnesses on cars are a pain in the ass and definitely are not heavy duty enough for being removed many times. With a fuse you have to find the fuse box, remove the cover, find which fuse to remove, then pull it out with pliers. It's far more work than you're implying. Also, this is done every time I take my car in for service whether it's a tire change, oil change, or engine change.

More importantly you need to remember to put it all back together when you return the vehicle—not necessary with a switch.

It seems Canadian vehicles handle both use cases by allowing the vehicle to have the headlights off but only when parked.