I have completely lost any hope for this, as it simply won't happen anytime soon. Would love to be proven wrong, but not gonna happen. I hoped the official eGPU support might provide an acceptable compromise, but in the end it looks like the driver support for Nvidia cards is so flaky that the whole thing isn't really worth bothering with, professionally speaking at least.I want one without a AMD GPU. Nvidia with CUDA support please.
I don't think it will happen, but a guy can dream.
I really wanted to consolidate all my work on a single machine, but finally gave up and asked for a work-issued workstation with Nvidia GPUs to do the heavy lifting. It's simply the only feasible solution for ML/DL, and given how many scientists and engineers love working with Mac computers the fact that Apple is completely out of this field is a total bummer.