Typing this on my iPhone SE, I replaced the battery myself a couple of years ago and am planning to do it again soon. It's only got iOS 15 but it's still getting security updates and works well.

The first Gen SE? Mine was getting too slow with iOS15 with barely 5 usable tabs in Firefox before app-switching would kill them. Plus, too many apps gave up on designing for small screens so I had lots of unreachable buttons and input boxes.

I booted it yesterday, and it still has that issue where you can’t type a alphanumeric passcode on boot, because the keyboard doesn’t show up. The workaround is to click on emergency, then get back to the passcode screen.

I suspect my general usage might be a bit more basic than yours - my main apps are WhatsApp, FB Messenger, Safari, Gmail, Google Calendar, Google Maps, Spotify, YouTube and Netflix.

I'm also on a 1st gen SE and it's a great phone but the end is probably near. OS upgrades stopped last year, I've had one dumb app I can't use because it needs iOS 16+. Also I fancy having eSIM which the phone doesn't have. I think maybe the 13 mini next?