You don't have to worry about "display hardware protection" when it comes to adjusting it frequently. The purpose is straightforward. Dimming is not just to save on power. Dimming is necessary depending on light conditions (dark or bright) which in turn saves you power and avoid excessive recharging which could affect the battery's life span. To me, there is no such things as disadvantages when it comes to adjusting display brightness or setting it to auto-off when not in use.