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Technically the Macintosh lineage is the Imac since the original Macintosh was an all in one... but for those of us who grew up professionally using Mac's in the mid 90's the Macintosh's are the customizable desktops.
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Folks whose image was formed while Apple was in decline and the "lost years" view of the Mac is skewed. That isn't what the Mac was about from the beginning.
The Mac was always about a "box that just worked", not the core foundation for an erector set.
There were ads about how the Mac was "portable" ( since this was really before laptops). The 9" screen was to make it "luggable". There were several bags that were sold that original Mac fit into the size of large backpack :
[ A large number of images of the Apple ads over the years
http://www.webdesignerdepot.com/2009/09/the-evolution-of-apple-ads/ ]
Given there were no external wires besides the keyboard and mouse it could be easily packed up and moved.
So really the MacBook is just as close to the original Mac as the iMac is. 11" and 15" screens are much closer to the original Mac 9" than 24" and 27". You can't put the iMac even in a large backpack and move it.
Laptops are "all in one" also. Just even smaller as to be even more portable.
Somewhere along the way folks bought into the notion that the generic PC form factor was the prototypical "Mac" form factor. It wasn't. The Mac II was necessary at the time because technology was immature. It isn't anymore. There are subcomponents chips of modern era Macs that have more transistors and circuitry in them than an entire Mac II.
There is a certain subgroup who try to postulate that the Mac really didn't start until the Mac II. In that revised history, the Mac has to be a large heavy rectangle with no monitor. That is part of Mac history but the Mac as a whole would have failed if that were the only Mac sold in the mid-late 80's.
I think more people are in line for a MacPro than the MacMini,
That's quite doubtful given the price differences.
and the margins on the pro are HUGE.
Relative to the general PC industry the margins on all Macs are huge. Apple doesn't need a super high margin workstation to offset the razor thin or even loss margins of some other Mac model. They all pull their weight in the rowboat.
Doesn't make sense other than Steve Job's dying wish was to kill desktops cause he had come to find them "distasteful" and overly complicated which I fully believe now.
Actually, this "lack of R&D" update would make more sense if it was when Steve Jobs was alive and in charge of Apple that his wish was to kill desktops. Him dying may have commuted that sentence and this is the result of not having worked on any significant updates for much of 2010-2011. If Apple just started on a new Mac Pro in November-December 2011 this is almost exactly what the result at this point in time would be.
Or if they did start on something and it failed in some large way, they'd have to start over... which again results in this same "placeholder" update to buy more time.
However, again this says nothing about the Macintosh. The Mac is more than any single product model.