Because the pettiness of "mine is better!" really matters in the business world where Apple's stocks skyrocket at the announcement of a new phone and Samsung gets a blip if it's lucky.
They ran ads dragging the iPhone's glass body, the non-removable battery, and being prone to bending yet they go and make a metal and glass phone with a non-removable battery and take away the microSD expansion slot as well and blatantly rip off TouchID, iOS 8, and Apple Pay.