Earlier quoted context omitted.
What does it improve, in practice? For myself, I need my phone to make phone calls, take photos/videos, occasionally run apps, and to be a wifi hotspot. My iPhone 6S did all of these well enough that I only upgraded it recently because I dropped it and bent the power button. My new phone has a slightly nicer camera and better battery life, that’s about it.
I actually also do not find new phones that much of an improvement, but just to be a devil' advocate: 1. High-resolution screen, finally approaching paper (600dpi) 2. High-refresh rate screen, up to 240 fps. Once you see 60 fps, you are already hooked, and 240 is just mind-blowing. 3. High-resolution camera, 50 Mpx means that the camera actually starts to match paper (600dpi) 4. Slo-mo camera (240 fps) to match the s…
I'm a sample size of one, but I'd rather have 20% better battery life (this would extend the life of a three year battery to roughly four years) than eye candy. Extremely aggressively glued-in batteries turning into hazardous gas packages are the only reason I replace portable computers these days.
And -given the history of such things- lack of care in system design means at year two or three, you'd find that your phone very, very inconsistently delivers 240fps. I think it's pretty widely known that once you get to somewhere around 15 or 30 FPS sudden variation in frame rate is far, far more noticeable and unpleasant than rock-solid "low" frame rate. [0]
[0] That is, a 240 FPS system that janks down to 30 FPS every few seconds is gonna be considered much less pleasant to use than one that always runs at 30 FPS.