I would not be surprised if making millions of $'s in cases at least plays a role in such decisions.I'm 70% convinced that Apple has staggered out these camera improvements to make sure that people buy new cases... It also means any second hand cases can only be used on the model it was meant for and are only relevant for owners of that exact model.
Edited to add: this was partly said in jest - and of course this will just be part of the business plan outlaid by Apple. I'm not criticising the move, I actually think it's genius and well thought-out.
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