But haven't those anecdotes been debunked already? A counter-anecdote is my non-plus iphone 7 with whatever the latest ios it supports (15 something IIRC) that opens the camera as quickly as when it was new. Apart from Apple Maps, which never worked well for some reason, the apps I use don't lag. Google Maps is fine. My motorcycling mapping app (scenic) is fine. Lightroom is fine. Hell, even MS Teams works like it does on newer devices.