One problem is LEDs are ON or OFF. There is no in between. Dimming an LED is done with PWM (Pulse width modulation) which basically switches them on and off very fast to give the appearance the are dimmer. but the LEDs are just as bright. One can probably notice if you shift your view quickly it will look like the LEDs are flashing. They are. Car companies won’t fix this. It will cost a few extra dollars.
The average energy delivered is less; and, you eyes respond to average energy. If PWM modulation of LEDs did not work that way, OLED TVs wouldn't work.