So we need to decide whether to support iOS 7 or not. By the time our app launches (hoping to be around June/July 2016) there most likely will be an iOS 10 (or soon to be). Furthermore, as of today (Jan 2016), 7% of iOS devices are running version 7 or below (https://developer.apple.com/support/app-store/). Of course I'd like to be able to get as many users as possible and that means supporting iOS 7 from the get go, but only if that doesn't translate to more dev hours or testing.
So, with your experiences, does it take a lot of branching to support iOS 7 as opposed to iOS 8+?