In benchmarks, sure. But day to day, the new phones only really show their speed in things like games. The Everyman is good with a 6S. That's about when peak phone happened. That's when phones got "fast enough". That's why the 6S is still one of the most used iPhones (14% last number I read.)
Tinfoil hat theory: Is apple holding back their x86 offerings so that their in-house arm processors can catch up performance wise? Perhaps in preparation for an all-arm line up?