The price didn't change much between 2016 and 2017 either. But bunch of tech could include the first generation neural engine.
top of line iphone 4s to 5s to 6 to 7... all costed around $700. Those generational updates were huge leaps too. All big leaps like iPhone 7 to iPhone X.
But the leap to iPhone X pushed the cost from $700 to $999.
Instead they pulled a sleight of hand on you by adding a glass back to the iPhone 7 and naming it iPhone 8 and calling that phone the next gen leap with the same pricing.
It's a brilliant marketing strategy really.
First generation neural engine is a leap forward yes. But that's par for the course in tech. That kind of leap is meant to happen so you buy the new version. Like Siri on the 4s, retina display on the 4, touchID on the 5s. But did any of those phones cause the price to jump almost 45%??