Cook and co will look at the numbers.

tl;dr: it's all about the iPhone, to the tune of 90% of revenues.

That 90% is there in no small part because there's an app for that. At the moment, Apple is determined that those apps are written on MacOS.

(It's worth noting at this point that Apple does not (and probably cannot) eat its own dogfood when it comes to running the business; LOB apps are not Pages and Numbers, it's Word and Excel, and their internal messaging is Exchange.)

Anyhoo, hardly anyone is buying desktop Macs any more and of that small number, a low single-digit percentage is buying Mac Pros. The black bin Mac Pro was hubris writ large. It's completely impossible to meaningfully upgrade; you can't rack-mount it in any sensible manner; and probably most telling, the thermal budget is so low that it's trivial, in 2017, to spend literally £1500 to get a PC system that will comprehensively crush a maxed £8000 Mac Pro (pro-tip - you do this by buying an Nvidia Titan X card).

tl;dr: Apple doesn't own the creative sector any more; you get more bang/buck in PC land (whilst running the exact same software) and since Dell (and others) started making displays that matched and even exceeded Apple's, another reason to buy Apple disappeared.

In performance computing-land, Apple bet on OpenCL and the world went "ha, fuck no! We're going to get us some CUDA lurve" and so the already uncompetitive Mac Pro went from "expensive trinket" to "expensive, stupid trinket".

Apple will refresh the Mac Pro not for any business reasons, but because if they don't, they will come under pressure to port XCode to Windows*.

If ever that day comes, Apple will exit the desktop PC market.

Apple's problem here is that the ridiculous design of the black bin Pro has given its userbase five years to figure out high compute/GPU alternatives, whilst not offering any of those alternatives itself (even the gruntiest graphics card you can spec in a top-of-the-line iMac is basically crap; you can't fit more than 32GB in any current Mac, which is just fucking ludicrous in 2017, etc. etc. etc.)

*I think that Apple is currently and paradoxically simultaneously more successful and more vulnerable (in phones) than ever before. The hardware gap between iPhone and everything else has more-or-less closed - Samsung, Sony, and HTC (and maybe LG) can all build a handset that matches iPhone on fit'n'finish, despite what the zealots will try to tell you, and they all offer more options and choice. I'll let you know on the 20th whether the software gap seems to have closed - but it's definitely closing. Apple's business strategy here is to go "premium", pushing handset prices ever upward, but even then, a nod was given to the "low" (har har) end with the iPhone SE. What all this rambling leads up to is that if push ever came to shove, Apple would cheerfully and without hesitation sacrifice the Mac in all its forms, if it meant keeping iPhone healthy.

But I did read an article that shows just how dependent Apple is on other people's software (and hardware) to run their business - to the point where the only bit of an Apple store that runs on an Apple platform is the POS, which is an iPad.

"Other people" is of course "Microsoft" and "Oracle" and "Dell" (other big PC OEMs are available), with filthy communist Linux doing its usual infrastructure turn.

Even iCloud is smeared out across AWS and Azure.

I can't wait for Apple's famous capability in cloud to be entirely in their hands :)

As for the Store bit - yes, there's no Windows in the physical Stores, but there's no Apple platform in the stuff that the POS iPads and front-end Macs etc talk to.

I heard that they're a big SAP customer, which means for all practical purposes, they're an Oracle shop, too. That'll mean either Windows, Linux or (gawd help us all) AIX at the back end.

It goes like this: MS made their own cloud to run on their own OS to support their own platforms and they used their own dev tools to do it. They understand the whole thing top to bottom in excruciating detail, and then they run their business on it.

Amazon built AWS to run their business on, and they hired a shitload of really smart people to do it, and they had the ultimate micromanager at the top deciding everything.

Google's stuff runs their business (there's a trend here,) and they too hired a shitload of really smart people and wrote a fuckload of their own software to do it.

Apple run their business on SAP and Oracle and AWS and Azure and Google and they simply don't have the culture or talent (there's only so many sufficiently talented programmers out there, no matter how much money you wave around, and they've still got to be managed right, otherwise they'll just write the best bug tracking system in the world) to build a platform that can do it.

They'll spend a fucking mountain of money on these data centres, and on programmers, and on consultants, and they'll end up with pretty much what they've got now - a cloud system that's mostly used to store photographs.

tl;dr: Apple is a hardware company.

ETA: All this is a throwback to drook's comment about not writing code that's not relevant to the core business. Apple's core business is iPhone, not iCloud.