There is a legendary story about how Steve Jobs, upon his return to Apple, drastically cut-down the number of models that they offer. How on earth have they forgotten that lesson? Trying to figure out the differences between the 9.7" iPad and iPad pro is not easy, and regardless, it makes it harder to buy.
Also there was reason why Steve Jobs was against all tablet sizes except one. At the time Apple was going after revolutionizing the education market and the 9.7" iPad1/2 fit the bill for that purpose exactly. Then came the iPad mini whose sole purpose was to increase business bottom-line… and then a few more models based on other focuses or potential uses. Meh. Moral of story: Do not destroy the initial momentum and…
The Lumia lineup started out okay with a flagship device (920) and mid to high range device (820) a mid-range device (620) and a low end device (520) and a nice photographer device (1020). Things started getting really blurry with things like 925, 930, 635, 730 (can't remember them all) and suddenly a lower number device actually had better spec or almost similar to a higher number device, or the specs were so close together that it looked really confusing. Not to mention people begging for certain models to be upgraded and it never happening meant angry customers.
To me, it looks like Apple is slowly making the same mistake albeit a lot slower. You would have thought they were paying attention and wouldn't go down this route.