I bought a car (Citroën) a few years ago, and told the dealer I wanted it so the rear lights would always be on. They configured whatever doohickey is responsible for that, and made sure to charge me for it. But now the rear lights are always on, like they're supposed to, and I feel a little safer.

I think it's super dumb that it's not a requirement any more, and I don't see any reason for the change.