Annual adopters will upgrade regardless. Regardless of the bullet points, there is always the assumption that the next iPhone will be better than the previous, even if its just a stat bump.

For people on a 3-5 year cycle they want to know what the annual drip-feeds have snowballed into by the time they do upgrade. Its all very well a reviewer saying 'it has Pro Motion' but what does mean to somebody who has never paid attention to their screen refresh rate?