For the reason most Unix / Linux enthusiasts love CLi so much, to a point they hate GUI associated with it. While GUI is what is exactly needed to penetrate masses - reason why MS became so popular, and with steady income growth in '3rd Tier' countries more people can now afford Apple products - again GUI based (plus glamourous image of Apple" that Apple is consistently doing well.
My point is, that an attractive design is to hardware, what GUI is to software. Apple does both very well.
Its the late development / awakening of GUI relevance that made Linux loose out in addition to geeky image that it held for years - still does.
On Servers, CLI is fine.