Recently, I almost ran into a car driving significantly slower than me on a moonless night because the vehicle had no lights illuminated from the rear. I thought they were driving blind, but as I went past, I saw the car had daytime running lights and an electronic dash that must light up day or night.
I have noticed several more instances of this. It would seem these DRLS provide (just) enough light at night for these drivers to be unaware that they have not switched on their headlights, and are vulnerable to being struck from behind.
To me it’s dangerous and a massive Achilles heel. I hope car manufacturers are under pressure to fix it ASAP.