Last time I cared how much RAM any phone had, iOS or Android, I was working at Augmentra on the ViewRanger app, and we were still supporting older devices with only 256 MB.
That was… *checks CV*… I left in April 2015.
I think RAM is like roads: usage expands to fill available infrastructure/storage.
That an iPhone today has as much RAM as the still-functioning Mid-2013 MacBook Air sitting in a drawer behind me is surprising when compared to the 250-fold growth from my Commodore 64 to my (default) Performa 5200… but it doesn't seem to have actually harmed anything I care about.