When Tim Cook first took over and every update was greeted by a certain segment of detractors as 'not what Jobs would do,' I wasn't at all sympathetic. But this many years in I think Tim Cook is merely a bean counter and as Steve Blank argues
here, out of touch with the end user experience and doesn't really understand what gives value to the Apple brand. Cook has focused on short term profit and been successful but along the way has eroded the long term value of the brand. We see this in the negligence of product lines and the manufactured obsolescence of others as well as the user experience (dongles and devices that don't work out of the box with one another, i.e. iPhone and MPB - "it just works" is now a dead slogan).
I've often thought of the Mac Pro and Cinema Display as simply advertising for the brand itself, comparable to elite sports cars auto makers have. They don't sell many of them but the tech in them sometimes filters down to lesser models furthermore they tend to attract a lot of attention to the brand. There's no reason to give up the Cinema Display or Mac Pro - just a lack of vision. Making solid long lasting computers at both the top and mid range level is an insurance policy that consumers will stay loyal to the brand. No coincidence as Apple shows a lack of interest in these areas users are questioning what's worth staying for.