I replaced the battery at one point. I can assure you many apps did not work way before 2019 you would get a message saying this device is not supported from th

I replaced the battery at one point. I can assure you many apps did not work way before 2019 you would get a message saying this device is not supported from the App Store. Perhaps part of that is on the developers of the app but by Apple not requiring backwards compatibility it essentially did the same thing as if they themselves did not maintain updates because what is a smartphone with out the apps?