Better camera is not just the optical quality or even processing though. Older phones gets slower, either because of the dying battery (that could be replaced,

Better camera is not just the optical quality or even processing though. Older phones gets slower, either because of the dying battery (that could be replaced, but many of these people are on subsidized phones so upgrading is baked into their plan), or software bloat slowly creeping on. When camera boot up, shutter lag or post processing starts to take one sec or two, moving to a newer phone is the obvious option.