Not sure what your point is here, as Apple has never released a device with an "officially user upgradable" CPU.
I wasn't really suggesting they could or should make the CPU upgradeable.
However, in other threads, people have been trying to defend the $6000 entry-level price by pointing to the extreme upgradeability of the system (and it
does have more PCIe and RAM slots than your $3500 HB Z4). Trouble is, the sort of users who are going to (say) load this up with quad GPUs, an afterburner and 1.5TB of RAM (which the entry-level can't actually handle) will typically (a)
also want something better than an 8-core processor and (b) not be the sort of users who would consider a DIY warranty-voiding upgrade to save a few bucks.
Sure, 3-5 years down the line, when used MP7.1s start popping up on ebay, upgrading the CPU will become a useful consideration.
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Totally agree, I mean how long is your warranty going to be? The standard one is what 12 months max, unless you get Apple care which is then 4 years total possibly?
If you're talking about the "pro" market at which this machine is supposedly aimed - i.e. the customer is a business rather than a private individual - then it will be
very common to take out 4 years of Applecare or get a third-party service & support contract that covers the planned useful life of the equipment. A lot of businesses will lease the equipment rather than buy it outright (far more tax efficient) probably with service&support built-in.
The sort of IT support that can (or, to be fair to the IT crowd, is
allowed to) change a CPU is increasingly rare these days - and if you're that lucky, why not have them whip up a custom PC precisely tailored to your needs?
NB: We've been talking a lot about 'upgradeability' when what we really mean - if we're accepting that this is a 'serious callers only' machine - is
configurability - the ability to buy a machine with the specification that meets your needs and into which you can install any specialist hardware you require.
The problem Apple faces is that professional-grade PCs, workstations and servers are almost infinitely configurable from a vast range of motherboards, CPUs, GPUs, cases etc. and if you can't build one your self there are plenty of specialist companies that will build and support something to your particular needs. The $3000 entry-level graphic designer's workstation doesn't have to share a chassis, motherboard or even CPU family with the $15,000 racks in the render farm. With the MP, Apple produced a one-size-fits-nobody chassis and motherboard which is over-specified and over-priced as a entry-level system but won't compete with custom PC builds at the high-end.
What Apple
really needs to do now, I think, is find a way of licensing MacOS on generic PC hardware - rather than trying to force people who need a pick-up-truck to buy a gull-winged luxury SUV. OK, that went badly last time, but the market has changed beyond recognition since - Then, pro media workstations were Apple's bread and butter. Now, Apple has a huge 'consumer' customer base who
want laptops, minis and all-in-ones. Then, PCs were still running a warmed-over version of DOS that barely supported 32-bit processors and Apple had a superior RISC-based architecture. Now, hate all you want, but Windows 10 is actually a pretty solid, modern OS at its core, and at the end of the day Macs are technically little more than PCs in nice boxes with a different OS - and while you can sell laptops and iMacs on nice design, as you move upscale and function becomes more important that form, it becomes more and more obvious that hardware assembled from off-the-peg components cost less for the same technology than Apple's bling-y 'bespoke' machines.
Or, just make a decently-powered Xeon/i9/AMD tower (which, in 2019, isn't going to appeal to iMac customers, but will be much easier to design) from generic components in a nicer-than-average case and charge a
reasonable premium for the ability to run MacOS.