I don't see why AMD would be any better-suited than Intel, Intel has a whole decade of extra experience with memory controllers in NUMA environments as AMD does from providing most supercomputer CPUs between the last viable Opteron and current day. This is fundamentally the same set of challenges as multi-socket systems shrunk down to multi-chip package level. Packaging-wise, Intel has more multi-chip packaging options than AMD does, so no advantage for AMD there either. AMD may have "more experience" with HBM but you have to keep in mind that the fundamental operating principles of DRAM haven't changed since PC60 SDRAM, so being earlier at adopting a new packaging or frequency/timing range standard with minor tweaks does not mean much.
As far as the consumer space is concerned, Xe is primarily aimed at datacenters, that's what the scalability aspects are aimed at. I doubt the consumer space will be seeing more than a single GPU die for a while, if anything.