I think we should distinguish between Apple's _restrictions_ (as in App Store policy) and the _constraints of their engineering_ (as in the serviceability of unibody laptops.) I'd venture the latter is weighed against e.g. weight and battery life, not "restricted" out of spite.
Could Apple deliver the specs of a Retina MBP with a replaceable battery?
> Could Apple deliver the specs of a Retina MBP with a replaceable battery?
They can certainly deliver the specs without switching to proprietary screws. That colors their other actions and makes it far more likely that the unreplaceable battery is about control and not about delivering certain specs.
Could Apple deliver the specs of a Retina MBP with a replaceable battery?