i've always jailbroken my phones, but not my new one. at this point, i'd prefer to be running ios10, & keeping the OS up-to-date, than tun a (now) much-older OS (altho i do miss a handful of tweaks/customizations). what OS is your phone on?
I'm on 9.3.3 so its ok for me considering I dont like the new notification center in iOS 10, I was already planned to stay on iOS 9 for a while so thats why I decided to jump in the opportunity of the new jailbreak and do it.
I couldn't care less either. I don't even know how it could be implemented that would look good. Dark mode safari? Okay, so you have a dark top bar and a dark bottom bar. White screen in the middle. The only apps that this could truly work on are Phone, Settings and Messages.
It works for many apps. Messages, mail, Facebook messenger, music app (it looks very well in music app) clock, settings, app store, iTunes and some third party apps. You can turn off Eclipse 3 in some apps if you don't like the difference so there is no reason to not like it if you want a darker mode.
There are multiple reason some people like me want and need a dark mode for other reason like cosmetic one. For some people its way easier to read when text is white with a darker background, and for visual impaired person, its almost 90% the case. Also, the default apps are so white that its normal for many folks to want a darker theme. Pre iOS 7 did not need a dark mode, so the real question is, why people begins to complain about this after iOS 7.