> couldn't thumb around...
Double tapping the home button makes the top of the screen reachable
That being said, I too still use iPhone 5S & I don't think I'll make the switch, 4K video & 2nd generation Touch ID are nice but I WANT 3D Touch. I understand why they're not there yet --- they had to shove some of the battery on the 6S to fit in the 3D hardware.
EDIT: seems they stuck with the first generation Touch ID? (6S and SE) [1]