Whaaaat? I'm on my 3rd iPhone and I never found this, I just assumed that Apple was punishing people who wouldn't upgrade to 6s by denying them this feature.
Drag space bar is new in 12, but two finger drag on iPad has been around a bit longer.
It’s a bonus for SE users without force touch. Seems obvious to include this, but I assume the reason they went back and bothered with it is the new XR taking force touch back out.
Fun fact, before Apple so graciously incorporated this feature into their software, it was a tweak you could install after jailbreaking the previous versions of iOS. Same with the "quick reply" from notifications and a dozen other actually useful features. This behavior from Apple reinforced my belief that all they do is absorb other's innovations, make them shiny, and then sell at a ridiculous markup.
I agree with the author that the iPhone is hard to use
So you don't actually need 3D Touch to have the benefit of the awesome cursor UX.