This is tough. On one hand, there&#x27;s obviously a demand (of which I am part) for f.lux, but on the other, 15 million downloads, despite being a respectably big number, barely registers compared to an install base that can grow by 75 million in a single quarter. Using private APIs does negatively impact the iPhone experience (witness the constant screen wakes in the pulled Xcodeproj), and making those APIs public has development overhead – As big as the iOS team may be, its human resources are finite (even if Apple&#x27;s cash reserves are barely so).<p>That said... What percentage of Apple&#x27;s user base lives with disabilities? What percentage is visually impaired; what percentage has motor difficulties? These are clearly worthy, comparatively small populations of users that Apple devotes an otherwise-inordinate amount of development resources to. Maybe it&#x27;s time Apple considers melanopsin sensitivity worthy of admitting to this circle.