I lean more toward B because of the language used. It is NOT a necessity (subjectively). The mini rant about a close system makes little sense. You can jailbreak and get it, so good. And when you can't use it, instead of adjusting usage, OP complains.
So you're against a positive change because of how one person delivered his opinion in the matter? Now THAT makes little sense.
You're missing the point. This is not about people who keep using their devices at night without f.lux and complain about the effects, claiming it's Apple's fault. This is about wanting Apple to add this tweak as an option to iOS in order for people not having to adjusting their usage patterns.
This isn't about how we can avoid being adversely affected, this is about why we need to be when the solution is so simple, and readily accessible.