Or if they were allowed to or told to,
Beside some usual form of programmers' rectius software engineers' lazyness and historical shortsightedness I suspect that the real issue is management, driven by a debatable company culture and sometimes by evident incompetence.
jaclaz
I use f.lux on most of my devices, and I found that I do sleep better than without it. Not to mention reduced eyestrain is nice.
On my iPhone if I press and hold the brightness slider I can activate “Night shift” mode which filters the blue light.