Interesting…. That makes some sense at least. Still drives me nuts but if there was some logic at play I’ll leave it be lol.GM's have been like as far back as I can remember. I have an idea it's because some states you are not suppose to use them unless weather requires it. I had an employee cited for it a few years ago in Montana out of all places. He was told unless the weather conditions required the lights, they are to remain off.