Summerlight's point was that
if you take Apple's argument at face value (that iOS and the App Store are so tightly integrated as to be indivisible), then it boggles the mind that Apple could then turn around and sell you iOS (via an iPhone purchase) but
not include the App Store in that same transaction.
Or, in a sentence: you can't claim something is indivisible, and then charge for its pieces separately and at separate times.
Your point is probably that developers and customers are two separate groups, and there's a history of making a thing free to customers (the App Store) while charging vendors (developers) for the privilege.