Apple is usually pretty good at keeping older phones performant enough but,

This is the first upgrade cycle that I upgraded in anger over an unusably slow and energy inefficient OS on an “older” model

I was traveling in south / south east Asia and my iPhone 15 Pro was dying twice a day despite minimal use besides maps and taking some photos. My battery health was 86% so not perfect but surely it shouldn’t die twice a day.

That coupled with the keyboard constantly lagging with every letter I typed made me realize Apple no longer cares about older models.

They threw that out with Liquid Glass.

I wish Android wasn’t also closing off their ecosystem.