FACT: iPhones are getting bigger and our hands are staying the same size.
Reaching butons on the top of the screen with tiny paws can be PRECARIOUS.
Luckily, our Apple overlords have thought of everything. If you double tap (tap, not click) the home button...
...The screen slides down so the top buttons are within reach of your thumb.
And on the iPhone X, which doesn't have a home button, swipe from the middle of the dock bar down for the same effect.
You can turn this feature on and off by going to Settings > General > Accessibility > Reachability.
No more overreaching with our thumbs: That's innovation, baby!
H/T Stephen Rankel !!!