BTW, by "optimizing" laptop to customer needs, they sell machine less future-proof, which will result in sooner upgrade. I always believed that companies make more money on entry-level models than on professional ones. (not just apple)
I don't have numbers or sources to back it up, but in my experience at least, people who were satisfied with an entry-level model didn't keep track of newer models and weren't interested in "upgrading" unless the thing was about to die or there were substantial benefits.