I try to avoid booking flights on a 787 due to the window locking issue.
Some of my best experiences on night flights have been watching the Aurora and spotting shooting stars outside - which of course would only be possible with a fully open window, or in the case of the 787 a window set to 1.
On day flights I want to watch the scenery and try to identify cities, mountains etc and take photos. The window really needs to be set to 1 to get a clear enough view. Plus I want to be exposed to daylight on a daytime flight!