Apple turned the computer into a consumer device. As such they were able to sell them to people who wouldn't have bought a computer otherwise. Removing stuff such as ports and floppy drives made them attractive to a lot people: SWMBO hates my electronic gadgets because of all the cables. SGI was in a completely different market but Apple, like Microsoft before them, managed to use the consumer product to drive business sales.
Personally, I never liked the IMac but putting the computer into the screen also made it a much more portable solution.
Biting the hand that feeds IT
