Alright. But let's pretend, you upgrade every year.The last iPhone I bought was in 2018 and the next iPhone will be when the iPhone loses software support.
After 5 years, what would be better for the environment:
5 phones in rather big boxes
+ 4 unnecessary power adapters
+ the fact, Apple would need to manufacture those adapters, despite you don't really need them,
or...
5 phones in smaller boxes
+ 1 power adapter in a small box
+ the fact, Apple would NOT need to manufacture those adapters, because you can use the one you already have?