Well, I'm referring to PCIe expansion (with the support of current gen cards on the market/newer gen cards), internal storage solutions, and memory expansion. The current Xeon MP can scale pretty high up according to user needs.
No doubt an AS MP would be faster, the question rises, can it expand as well? Whole premise of the Mac Pro, is true modularity/expansion but the whole premise on AS, is unification. If Apple can't deliver on the modular aspect, it defeats the entire purpose of the machine I feel.
I hope the new MP isn't what the trashcan MP was. In essence, the Mac Studio is basically that (be it, a lot faster, in bigger Mac Mini form), with expansion being sent through TB/USB4. People seem to be okay with that now for that specific machine, but I feel people would freak if the new MP saw that same treatment. The MP needs to be expandable imo.