It has been some time since I flew a 787. I was on one of the first few months of the DEN-NRT segments. During that flight people (in J) were constantly dimming and opening the window "shades". They didn't get that there was a lag in response when adjusting the window tint. Consequently, the window tint continued to ramp up and down until the person tired of this or figured it out.

I wonder if the current "policy" is to reduce the tint cycling and wear and tear on the electronics.