In an academic environment, absolutely. Scaling is the second problem to solve, but iterating on model architecture is the first.
I said for ages that Apple should be able to make strong inroads into the machine learning market. I think Nvidia should be very afraid of what Apple will hit them with over the course of this decade.
Wouldn't call anything they're shipping there beefy, their top configuration seems about on par performance wise (more memory wise) with a GTX 1070Ti which is a mid range 2017 card.
It is simple: machine learning is part of the future and here to stay. Apple will need to do that as well. What better way is there to build expertise in it than to build your own hardware for it? Especially given how far they have already come in that domain? It is laughable to think that machine learning domination is not one of Apple's goals.