Earlier quoted context omitted.
Elsewhere in this thread I see comments that mention "low distraction", "calmer", and something about iPhones frying kids' brains. This all looks like snobbery to me, based on the association of monochrome paper with novels and writing and intellectual pursuits. In the 18th century we were scared that novels would fry the brains of young women, but times have changed and now it's iPhones that are sinful, and monochro…
By way of an experiment - set your phone screen to black & white (in iOS, settings -> accessibility -> display -> color filters -> [on] -> grayscale, on android, settings -> accessibility -> color & motion -> color correction -> [on] -> grayscale), and leave it that way for a day of normal use. Then, turn it off, and note how you react to the change. Folks aren't calling it calmer because they're trying to look erudi…
I suppose for some people this is an issue and they genuinely want a physical solution in order to stop habitually doing things they don't like, like Odysseus wanting to be tied to the mast to avoid the Sirens.
I can predict how my behavior would change if I tried this: I'd be pissed off because you'd ruined my game of Heroes III (1999). And Brogue would be slightly less pretty. Cataclysm: Dark Days Ahead would be much the same, and news sites and coding wouldn't change much. So my reaction would just be "this is gloomy", it's not like I need freeing from a hypnotic spell.