I totally sympathize with wanting a pro-lite Mac tower... but it won't happen. Try a Mac mini with an eGPU.
Even still, I'd much prefer a $2-3k Mac Pro-lite tower with i7/i9 CPU options, a few RAM slots and half the PCIe lanes of the $6k mac pro. But that is never going to happen.
It's been a stalemate for months and months now
2) Obviously there will be specific cases that call for Nvidia (or the advanced asics that Nvidia are putting out), but for most of the actual set of professional users that would do their work on a Mac, there's not really anything wrong with AMD's current GPU lineup. Their Vega cards generally do pretty decently on media production benchmarks.
It’s a little more nuanced than that. The link you provide goes into a little of the politics. In short, Nvidia have messed Apple around in the past, providing them with a batches of faulty processors that Nvidia refuses to acknowledge and suing them over mobile gpu design. Would you want to do business with a supplier that had done that?
In general having your PC platform provider refuse to sign drivers because they have a grudge from a decade ago is concerning - what’s the next important tool they might pick a fight with and ban? Imagine if Microsoft refused to sign NVIDIA or ATI’s drivers because they had some dispute over a part in the MS Surface product line?