The reason for DRLs was to increase the visibility of cars coming towards you. If conditions require rear visibility then lights should be turned on just the same as when DRLs weren't a thing.
You're missing the point. When a car with Auto lights has the switch in Auto, DRLs will be on in daylight and the car can work out for itself if it needs to have lights on other than DRL and in most cases, it's accurate.
Instead, these drivers leave their light switch in the off position (which still gives them DRL) because they've been told they are Auto lights and they don't have to touch anything.
I can understand why though, when my BMW goes in for a service, the light switch always comes back in the off position as when it's indoors in the garage the Auto light would present the dipped beams.