By using the phrase “Selling like hot cake” you’re inferring a MASSIVE amount of sales, right? Like, the hottest selling Mac quarter over quarter? Because when I say “No, it wouldn’t sell that well” I mean it would absolutely not be the hottest selling Mac ever. It wouldn’t be the second or third best selling Mac either.
Right now, in the real world, mobile devices outsell all desktop variants by a huge margin quarter after quarter. Releasing any desktop form factor machine, no matter what it’s internals are, will not change that. As I indicated, it WILL sell (because it fills a need for a specific price point), but wouldn’t sell like hot cakes.
From the reactions in this forum and elsewhere
Reactions on forums are reactions, not market data.
Maybe a majority wants something mobile.
You are ABSOLUTELY correct on this and I agree 100%.
creating the Mac Pro makes least sense, because it sits right in the smallest niche of all.
Creating the Mac Pro makes the least sense ONLY if you price it the same as an iMac. But they haven’t priced it the same as an iMac, so it makes total sense. It’s going to be a very low volume system, SO each system sold will have a high price. I would not be surprised if they carry almost no inventory of these and only make them BTO.
an upgradeable Mac below the Mac Pro would sell just as well as an iMac
Well, yes, ANYTHING at the iMac price point, will sell just as well as an iMac.

(And, iMacs don’t sell nearly as well as MacBooks.)
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So either Apple deliberately decided to not address developers and small/medium creatives or - my suspicion - they heavily underestimated customer's price sensibility.
Neither one. If you go back and read reports around the time where they first spoke about the new Mac Pro, the defined who their pros are, what systems they’re using and what they would need from a future Mac Pro. 30% of all users are defined by Apple as pros (folks that use a pro app at LEAST once or twice a month). Of those people, notebooks are by far the most popular Macs, then comes the iMac and then the iMac Pro. The Mac Pro is a single digit percent of all Mac sales.
With everyone split out like this already and Apple well suiting the needs of a wide swath of customers, there was only one set of customers it was worth going after, those that REALLY need more power than the iMac Pro.
So, it isn’t that they deliberately decided not to address developers and small/medium creatives. Those are in the 80%, there’s already a system out there for them (and they’re massively choosing mobiles over desktops). And, they didn’t underestimate customer’s price sensibility because THIS Mac Pro is made for those that NEED that much power. These are the folks that have been spending the last couple of years visiting Apple’s campus and going over their workflows. They look at the Mac Pro and see dollar signs for all the money they’re going to make with it.
The Mac Pro is a top end machine and the only folks even considering it is expected to be those folks that were thinking about dropping some cash on a higher end iMac Pro. Those folks plans may change. For everyone else, what’s out there is what your options are.