The iPhone is a good example: it wasn't until last year that you could have more than 2 versions (black and white)... and the 5c added many possible combinations with the off color cases. That's a product that had been on the market 6 years at that point!
So, actually offering all these different variations is quite a departure for them.
One argument for the Beats acquisition I heard was that Beats did this as well- they had many SKUs and many color combinations for each model of headphone and the argument went that managing selling a product line like that took a lot of special skill.
I wonder if this is the thing that Apple was really buying with Beats? (or more realistically, a big part of Beats value to Apple.)