Years ago other drivers in the UK would assume you left headlights on by mistake and might flash you.
And I though countries that required head lights even in good daylight was ridiculous overkill.
But having now driven in such countries its quite noticeable how much less conspicuous the occasional car with no lights can be. Especially if its also an inconspicuous colour.
Your eyes and brain adjust to some extent to poor light, but not always as well as you think. Look at how much cameras adjust their metering for changes in light you might not even notice.
I agree if the car puts on the headlights automatically when I might not have done so , due to wiper setting or its light intensity meter, its a good thing. (Unless I were up to no good in the dark and wished to remain undetected.

)
You might think 'If you cant see that car ,even without lights , you shouldn't be driving' . But every little bit helps.