Upgrade :) I just upgraded from my Samsung S8 to a OnePlus 8 and the difference is amazing. Apps install in a second again instead of 20 and everything feels snappy.

I don't upgrade often for financial and environmental reasons but we're not at the stage yet where smartphones are a commodity and performance is stable over the years. There's still performance gains every year and they add up.

Off and on Android (and iOS) developer here: no, not really, unless you throw top-end hardware at it.