It's just weird growing up with iPhones and going back to the days of subsidized phones, it was $600-$800 max if you destroyed your phone and bought one out of pocket. Now they have this range from $500-$1100 which just sounds wild. $1000 for a computer feels normal historically, but a phone used to be like a $600 max cost.
It's also why I don't have a problem buying used, phones just depreciate to nothing anyway now. From my 6S experience too, the electronics wear out and start chewing through battery life in about 4 years so eventually you have to get a new one. This sounds like a plausible explanation of the throttling issues that have plagued users, it sounds unavoidable so you are stuck upgrading.
Plus I'm just cheap too, so there is that.