The current legal position / ambiguity is less interesting than the moral and principled question: do we want to live in a free market captialist society where manufacturers (typically with the upper hand in the retail power imbalance) get to continue to exert control over my property once I've come to own it through a legal transaction?
Either we do, in which case what Apple is doing in perfectly reasonable, as is Walmart selling fridges that explode when you put someone else's milk in them ("It's in the contract!"), or it isn't.
Things like the first sale doctrine give an insight into past legal thinking suggesting the latter. But it's far from simple to discern by just looking at the law.
The music/video industry asserts that you're not allowed to play/show some media item that you've bought. Amazon doesn't allow you to resell or bequeath Kindle books. Caterpillar doesn't let you repair your own tractor.
The first sale doctrine was established in a very different time.
Either we do, in which case what Apple is doing in perfectly reasonable, as is Walmart selling fridges that explode when you put someone else's milk in them ("It's in the contract!"), or it isn't.
Things like the first sale doctrine give an insight into past legal thinking suggesting the latter. But it's far from simple to discern by just looking at the law.