I currently drive a BMW and I use them. But that’s because BMW driver is a state of mind and not based on the car you own. I am a Toyota driver at heart.
The state I currently live, Louisiana, and it seems like blinkers at all is a premium package upgrade. Hell, half the time cops don’t even use them around here. The only vehicle I can reliably see use them are out of state 18 wheelers.
Was behind a driver’s Ed car once, no kids, the instructor. No blinker used…
My brother once gave me a ride home from work, back before I could drive. He had a Mercedes. Not only was he drinking beer while driving, he refused to use his indicators/blinkers
When I asked him why he didn’t signal to other drivers, he said with a smirk “They didn’t come with this model” and proceeded to finish his can of beer.