And then the update after High Sierra happened and killed it outright. And as much as I'd rather boot into macOS for non-gaming items, because my monitor hooks into the eGPU, I boot into Windows for anything asides Xcode which is pretty heavy. Could stick to High Sierra, but that isn't exactly an option.
It truly is a shame that we couldn't just be allowed to change a flag or confirm a prompt to maintain business as usual. As such, this may be my last Apple branded PC and will just use it as a build machine in the future whenever I inevitably upgrade.
Maybe Nvidia and Apple will work together on metal drivers, but quite frankly, it is the edgiest of edge cases so I imagine the chances of that are minuscule. That isn't to say I don't somewhat understand their reasoning: they basically appear to be scaling back numbers of areas they can't safeguard or require support (non-metal drivers and 32-bit respectively). But at that point it seems like provide something that users can do to bypass it.