Smartphone design is mostly a solved problem. Take today’s screens and processors and throw in a few features from the past (removable storage, IR blaster, and headphone jack) and you have a 10-year phone.
I used to get a new phone every year because phone got way better each generation.
My phone is top-tier from 2021 (Z Fold 3), and I have had zero temptation from the newer versions. All they really have is faster processing, but since all apps are designed to run well on budget phones from 5 years ago, there’s no reason to upgrade.
My Galaxy Note 8 is a backup phone. It was a flagship when it launched, yeah. But even so, it’s 7 years old, the last update for it was over 2.5 years ago, and it’s still chugging along like a champion.