I have a pixel 6 pro, and it does look like I can't wash out the brightest. However on a grey scale test image I can lose the bottom 1/3rd of the range by goin

I have a pixel 6 pro, and it does look like I can't wash out the brightest. However on a grey scale test image I can lose the bottom 1/3rd of the range by going too dark. Maybe the brightness cap is to save battery.