You're also using a time period that includes COVID and when the DRAM manufacturers got busted for price fixing.

You're saying "RAM usage", but your evidence is "RAM provisioning", which is the entire basis for the criticism. The reality is that RAM usage has increased significantly, but Apple has been stuck by the addressable memory limits they've baked into their architecture.

As another point of comparison, a 2013 iPhone 5c (technically not released until the last quarter of 2013, but we're being generous here) had 1GB of RAM and 8GB of storage, though you could upgrade that to 32GB. A modern iPhone has 6GB of RAM, and comes with storage from 128GB to 1TB.

Maybe the bytes are growing more on iOS? ;-)