You missed an extra feature with the App Switcher shortcut. If you press hard on the side and swipe across the whole screen, it quick swaps you back to the previous app.
I use this feature constantly. It was one of my main reasons to jailbreak. iOS 9 is the first v of iOS that I haven't.
Hopefully the next gen iPhone will nix the home button & iOS 10 will bring a way to close an app with a swipe gesture that brings you to the home screen. A Tage UI if you will
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This. When introduced I thought, great ! When in reality, it's very hard to use & extremely inconsistent.3D Touch or not, text selection is the most infuriating thing that has been left unfixed on iOS imho.