I'll do you one better, car headlights should never be off while the motor is running. Just like motorcycles since the 70s (maybe 80s?).

No switch at all, ignition on, headlights on, period.

Niche counter example:

Parents who sit in their idling cars for (fucking) ages while their cars are facing the tennis courts thus blinding the player on the other side of the court for however long it takes them to either turn their car off, drive off, or someone to tell them turn their fucking headlights off.

Personally I feel like cars with headlights in the daytime on days with good visibility can be too noticeable. I find myself giving them too much attention because they stand out more in my visual field.

When the oncoming cars do not have headlights on I find it easier to give them just enough attention to see that they are behaving normally leaving more attention to devote to things other than oncoming cars.

I like this. Turns out a few countries require DRL: https://en.wikipedia.org/wiki/Daytime_running_lamp

Canadian vehicles require this by law.

But what about for electric cars? Maybe whenever the car is in anything other than P, and for 5 minutes after P?