We aren't in a post-card-slot world. Thunderbolt 3 only offers 4 PCI-E lanes. There are growing numbers of computation heave workloads that need more than that. The Mac Pro is woefully under capable in enabling these sorts of tasks. This a direct result of the modular upgrade decision.I can see why you'd characterize the mini (and perhaps the MP) as "Walking Dead" (although that IS about to change); but I would hardly characterize the Apple TV in that manner. It's development has ALWAYS been a couple of years (3 or 4) between Updates; but, it just received an Update to the hardware last year, and the OS is in constant Development.
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But in a post-card-slot world, there is simply no reason to have a computer that can double as a cat sanctuary (ignoring the static electricity!).
Now one thing that I predicted (and I think Apple did, too) that never really happened was external TB-connected Card Cages. I know there were a couple; but the idea never really caught on. The only vestige of that concept that remains seems to be with eGPUs. But when the 2013 MP came out, I thought there would be the Sonnets and LaCies of the world that would soon come out with 4-slot external Peripheral-card enclosures, for use with TB-equipped Macs. But it just didn't ever really happen.
I doubt there will ever be a "post-card-slot world" as highly demanding tasks require the fast access and bandwidth provided by those primitive slots provided in ugly, large computers.
Apple has made high end computing on their devices difficult. That's on Tim and Jonny.
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