iPhone 6s (not 6) level of performance and above is really enough for most people to do normal every day tasks (not gaming). People are going to be keeping their devices for longer lengths of time. Security updates for longer periods are essential.
Android phones just hit the "good enough" point a few years later than the iPhone ecosystem. My Samsung S7 (2016) is roughly as fast as my 6S (I have both for developing, and they're both plenty fast enough for everyday usage).
I don't think consumers are that interested in processor speeds anymore. Cameras are probably the biggest selling point for new phones these days, followed by battery life and display quality.
My S8 was reasonably priced with a 1440p screen. High refresh is horribly supported on android and nothing like display port adaptive sync. I don't to pay a new ultra price for what I already have.
I believe industry noticed that 1440p on 75mm width display is overkill (or say there are other points should be improved than resolution). It's good thing for battery and price.
I only replaced my 6S a few months ago, and found it perfectly good to continue to use, not just around the house but in some outdoor uses where my phone might be at risk. Yes the 12 has some features that are nice, but upon a few months’ reflection really its biggest advantage (to me) is that it is smaller.
Gaming worked fine on a game boy. I support the end of arms race in gaming and a move towards power capped gaming rigs with games to match. Other sports have done this and it has many benefits above and beyond CO2 reductions.
Early humans (at least some of them, I gues…) lived happily in the caves. We should ban everything and move back into caves. Just imagine how much co2 would that save!