I’d love to see a link to those sources if you don’t mind, one can never have too much information and I enjoy any technical read.
But from what I’m seeing, particularly when using Instruments during debugging, there’s anything but a bottleneck, or shortage of RAM.
Not that that surprises me, when we’ve been having this same old debate on memory efficiency, and particularly efficiency in an operating system developed in tandem with the hardware for what? A decade or so?
I may as well throw this in, though I would suggest using the search bar for the many, many technical discussions we’ve had on this subject in years past.
iOS itself is a very scalable architecture, iOS 13 for example is designed to run well on systems with as little as 2GB of RAM. I have been using just such a device for the past week and iOS showed no issues whatsoever and that’s with a battery which couldn’t last me 3 hours.
Even with the extra bells and whistles exclusive to the new devices, 4GB will be fine for the next 4-5 years of new operating system versions for the vast majority of people. Longer even for the less demanding, more casual users.