It is not Whataboutism. YOU can't prove that the iPhone would be a bad (or worse) experience without Apple's restrictive App Store policies. In fact, I argued that the mac has proven otherwise. You can still use the Mac App Store if you think it is such a superior offering.
All stores on the Mac are just clunky. As a customer why the hell would I want to install 4 different stores on my Mac, with separate accounts and payment details. I think it is worse for the customer in terms of convenience and risk, bad for the developer because of less exposure, the only benefit here for the companies is higher profit margins, but with less exposure they might have lower profits overall