Maybe in the past, but my iPhone 13 still has pretty good battery life considering the battery has physically degraded over the years. No update felt like it killed the battery.

Eh, I use an iPhone 11 that's 5.5 years old, with the original battery and to this day the battery life is not noticeably different from when it was new.

It's the first iPhone I bought and has lasted longer than any of the three Android phones I had before it.

Literally impossible for your battery life not to have degraded in 5.5 years, battery tech just degrades - my 14 Pro was noticably worse in less than a year.

Hence the use of 'noticeably', as opposed to 'measurably'. There's no point in arguing about subjective experience.