I don't think schools are the target market for a maxed out MacPro. Universities? Sure. But life is different there and work on a per-research-project level. The average research project is about 3 years (sometimes more, sometimes less). And that's where the money is coming from and people are hired on that level as well (at least junior staff and PhD students). I just bought a bunch of larger Dell Precision workstations and Razer Laptops (because they offer up to RTX5000 GPUs) for a new project in my research group specifically for this project. At some point (after 3 years) these machines will end up somewhere, probably in some basement or a lab where students can work on them and we'll buy new machines with the funding for the next project. It happens all the time.This would be true if you bought $1-2K machine, not a $25K machine. I do not imagine its financially sound to replace 5 Mac Pros costing $25K each in an institution like a school every 2-3 years. Those are treated more like industrial machines not an iPhone.
Also, from an industry point of few. Musicians/photographers/videographers are not buying MacPros because they have two jobs per months and need to get things done faster. They want to get things done faster to take more jobs. And that's paying for itself. So let's say you make $1k per job and this allows you to take 5 additional jobs per month... do the math. $25k and even $50k isn't expensive for a workstation that is making you money. It is expensive though for someone who is not making money with it at which point I'd question whether that person actually needs such a computer.
Depends on what you do. AMD is still missing instructions and libraries. Take the Intel Math Kernel library and try to get it run on AMD... good luck. Plenty of more examples exist, but in the end it depends on what you do with it and therefore if AMD is a suitable choice.Given they no longer have to use Intel CPUs why on Earth are they not using AMD Threadripper / Epyc!?
Also, there's a massive problem with availability from AMD. They just can not supply large numbers in reasonable timeframes, which might matter for initial orders but also replacement in case of failure. This does of course not affect the average home user, but when I have to order 10000+ CPUs that might become a massive problem, given many companies/institutions/datacenters around the world do the same. For for mission critical systems, I'd stay away from AMD as far as possible.
Also for Apple x86 is a dead end. As soon as they have their own AS SoCs, the x86 systems will be history. It makes little sense for them to add full AMD support to macOS. And no, despite the AMD hackintoshes, not everything works on AMD machines.