They have gained things like high refresh rate and OLED etc, though
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 prefer the crispness of text on a 1440p screen. Why should I pay more for less?
I wish you could get what you want. Why smartphone price rising is mainly due to almost all smartphone improving camera too much. I hate it.