Everything I've read leads me to conclude it was done for simplicities sake. There were several people who felt a closed system would be much easier for a new computer user to set up and start using. The fact it may result in faster replacement was likely considered a side benefit.thanks i will read up on it, i will be surprised if they were deliberately trying to force obsolescence on the early machines. i had some of the early apples and it just never seemed that way to me.
As for AMD I am happy to see they're growing their market share. It's good to see a return to competition in the processor space. For far too long this aspect of computers has been, relatively speaking, stagnant.