>If they want to use an old phone, they can just stop updating their apps and not installing new apps. And if the app developer has updated the app and sunsett

>If they want to use an old phone, they can just stop updating their apps and not installing new apps. And if the app developer has updated the app and sunsetted certain functions of the old version such that the old app no longer works right despite being installed? I've had banking apps, which I haven't updated, completely lock me out until I moved to the newer version.