Not SoC but imagine if Mac Pro's Apple Silicon chips look like that including CPU, GPU, NPU, controllers, and more. Btw Grace uses both LPDDR5x and HBM2e. I dont know why tho.
And then connect them all like that. Still can upgrade and expend. Well it's up to them to develop their own Mac Pro but at least SoC method won't be that problem for Mac Pro... if they design like that. If so, it's just a matter of time once they develop AS Mac Pro's chip in future.
Thoughts?