It's meaningful to developers, who that information is basically for.
Not sure what pricing of new models has to do with any of it really (and seems like plenty of people are still buying them anyway).
Numbers say otherwise. Why would they lower the price of the iPhones in Japan? Why Apple will not release anymore the amount of units sold per quarter? Simply because they are selling less and the only reason they are having revenue is because they are charging way more expensive prices.