Reachability is a feature Apple put into iOS to make using taller iPhones easier with just one hand, especially for the small-handed folk out there. But if you have the ability to reach that high up with just your thumb when using your iPhone one-handed or you want to make better use of the space when using two hands, then you might view the Reachability interface as a complete and utter waste of space.
If you identify as the latter category, then you’ll probably come to appreciate that of a newly released jailbreak tweak dubbed Carbonite by iOS developer Antique. This tweak aims to make the Reachability interface more useful by filling it with toggles and shortcuts that can make your life easier in day-to-day usage.