"Should" is a word that ought to be banned from this sort of discussion.

It's illegal in this country—the UK—to drive at night without lights. Doesn't stop it happening, though. Either someone forgets to turn the lights on, if they're manually controlled, or they actively turn them off because the UI is ambiguous (this happened to me, once), or the filament bulb burns out (again: filament bulbs are/were mandatory in the UK, originally to rule out carbide lamps without actually banning them), or there's a wiring/software fault.

The point is, vehicle safety measures should be fail-safe, and driving an invisible vehicle at night and relying on lights to make yourself seen is kind of the opposite of that.

Following that, it's hard to argue that cars shouldn't come with mandatory reflective strips. (Which, of the top of my head, actually doesn't seem like a bad idea.)

Most do. Every car and motorcycle I own has reflectors on all sides.

Do they? Every so often I come up on a vehicle at night with no lights on, and I've never noticed any notable reflectors, like say, runners wear at night for visibility.

should. ought. ....

That’s true. But I’ve found on a couple occasions that I couldn’t see a car in my mirror when driving at night because it was very dark colored and its headlights were hidden by my b-pillar.

This sort of thing wouldn’t happen much when headlights sprayed widely, but newer focused headlights are harder to see from the side.

Even if there are lights it still makes it harder to see, which is more dangerous.

Slippery slope there. Is all black paint dangerous? Grey?

Black paint that has almost no reflectivity at all certainly is.

My family talks about black cows that your headlamps just don't see and how dangerous they are, this would be even more intense.

Most BMWs don't sit idle taking up two lanes of traffic, they only do that for parking spaces.

All matte paint on cars is dangerous, which I suspect is part of why you almost never see it except as a dodgy repair.

Matte vinyl wraps are common on high end cars in NYC. I see one a week, easy.