Nice circle jerk going around in this thread.
If your workflow requires more than the old Mac Pro can handle why haven't you transitioned yet? The nMP came out in 2013, nearly 5 years ago. You are losing money and time. Why are you trying so hard to stay in the box when it clearly doesn't fit you any longer?
If you want CUDA go buy the NVIDIA DGX Station, it is a steal right now at $49,900 (25% off) or go HP.
Apple wants to leverage Metal 2 for everything, not CUDA or OpenCL. Unfortunately this requires a rewrite of every major software house out there. It takes time.
Having been in the pro market for about fifteen years now, I just don't think the pro workflow now is what it was a decade or more ago, and it feels as if Apple's whole approach to the market is painting them into a corner. Fifteen years ago, the gap between pro and consumer hardware (and software) was far more clear cut, dedicated GPUs barely existed, and a closed garden approach like Apple's was a clever way to capture an entire industry. It was worth investing in bespoke and in-house technology for those optimization gains - both for Apple and its audience.
But here's what's happened since then: Apple's monopoly on "must have" pro software suites has weakened, their R&D into growing pro markets is virtually non-existent, third party middleware is ascendant (where once you only needed Photoshop, you now need Substance Painter, ZBrush, and on and on...) and consumer-level GPUs have become spectacularly cost efficient and surprisingly good at handling certain pro workloads. Ten years ago you literally needed a Mac Pro to do pro level 2D work; nowadays it barely matters. 3D has seen an order of magnitude increase in use by pro users, but Apple offers zero hardware or software advantage there either.
So people can sneer at the thought of sticking a filthy consumer card in their machine, but the fact is the bang for your buck that you can get nowadays from those cards even in a pro environment pretty much brute forces its way past Apple's alternatives. And claims like "if your workflow can't use an old Mac Pro you shouldn't be using a Mac Pro at all" are exactly why Apple's position in the market is flagging. It's kind of like death by a thousand cuts: people insist "Macs aren't for 3D", "Macs aren't for game development", "Macs aren't for AI/deep learning"... but after a certain point you realize that there's virtually nothing left in the pro market to even cater to other than the stagnant/shrinking 2D scene.
Would the Pro line - indeed the Mac line generally - be as anemic now if a decade ago they'd actually tried to push themselves into those emerging markets, and embraced some superior third party tech that they stand no chance of catching up to? Would Final Cut Pro even run 5% slower than it does now as a result? I doubt it.