On the contrary...Minimal customization maximizes compatibility across apps/hardware designed to work with the platform. You don't have to worry if it will work with your graphics card if there is only the one, for example.
I never said anything about a nerdy kid stuffing cheap parts. I said the vast majority of computers sold do not get upgraded. They get replaced. I don't mind digging around inside, but most of the professional market doesn't do that. They buy a system, use it on a 5 year depreciation cycle, then replace it if they use applications that require it, or keep using it until it breaks if not.
This applies to like Intel, and small businesses like your dentist. It is cheaper for your dentist to pay IT to fix/replace his laptop than to fix it himself and miss out on however many customers it takes to solve the issue, and he really isn't interested in doing it in his free time which he would rather spend with his family.
Again, Apple and many others (Dell, HP, etc) have pulled this data, and it is always the same. Most people do not upgrade their computer after buying it.
You and I are the exceptions, not the rule.
In general I agree with most of that - not the GPU part though .
To use this as an example, Apple have made the GPUs they've been offering work prefectly fine , but they failed to supply competitive models for many years .
Which was bearable when GPU power was of limited use, which is a field that keeps changing and requires flexibility .
Ironically Apple was betting on that horse with the 2013 nMP, only to get it wrong by designing a proprietary solution ...
More importantly, the above mentioned BTO options should not be underestimated .
And that includes 3rd party components ; bulk buyers in particular might or might not upgrade workstations during their life cycles, but they expect a high degree of flexibility with their initial purchase .
You tell those cats they can't pop in certain PCIe cards and such, and you not only lose customers, you lose market share .
As for the dentist, my graphic designer and photographer friends , small businesses - they rock their Macs till they fall apart .
Then they have some freelance IT guy or an amateur friend like myself come over to squeeze some more life out of those things - which used to be simple and very efficient - and they are not well pleased when told they need to just suck it up and buy a newer model .
Oh, and they also need to stop using some of their old programs and buy a new scanner because OSX is no longer compatible with this or that .
I'm wondering how many Macs out there are held together by just USB 2.0, dongles and Firefox ...
It's not the expense, it's the disruption and changes in a workflow that can have a major impact on all but the most professional and affulent workstation customers .
Hence, I believe Apple needs to do a 180 and use their considerable capacities to reinvent the Mac as the most versatile quality computer line ever , workstations and others .
Or just get off the pot .