I'm going a little offtopic, but I cannot believe this. I haven't owned a Mac since having a 2010 MBP (which I loved dearly for 6 years), but I cannot imagine owning a laptop that doesn't allow me to switch the internal drive. It was annoying enough with all of the screws on the 2010 model.
I'm sure there is some justification is for this beyond "we want you to buy a new one if something goes wrong", but I'm coming up blank.