Even when being used as a computer, having the SD slot in the back is far from being "convenient".
Any of you have a device (camera, card reader, mac,...) with an SD slot? Try inserting a card with the slot facing away from you. Is it as easy as you thought? Now do it with important pictures on the card.
I can see a lot of SD cards getting scratched up or worse, broken in half.
Why don't the iMacs have a SD slot in the back?