OK, first off - I am being 100% genuine here, please bear that in mind as I am very aware that this could seem like trolling.
I used to run an iPhone 3GS - and to be perfectly honest back then I felt like jailbreaking was a necessity. Really - so many obvious features were missing, and couldn't have lived without SBSettings (for example). I liked the hardware and kinda liked the phone, but I felt that without a jailbreak it would be incredibly neutered! I then switched over to Android, as it addressed the way I use a phone more than iOS. And again, I have felt this pretty much until iOS7 came out. I think Apple made a big leap in the right direction.
So my question is this: Now running iOS7 - people still clamor to jailbreak their phones. Why? What "essentials" are people looking for that iOS7 doesn't deliver out of the box?