Well - I guess we'll know when benchmarks come out of SKL-X on games (since a high proportion of clowns use these exclusively as reflective of "performance") as to how important latency is when the software, compiler and scheduler are optimised to keep threads on the same cores where possible and prefetch data where possible.
Oh actually no. What will happen is the same clowns will pick out inappropriate results from inappropriate code and use it to justify their pre-conceived idiocy.
Sure doesn't seem this way now. Some games got patched to be much more aggressive on keeping threads on one CCX, or maybe even cutting the number of threads. But both Skylake-X and Ryzen are both suffering quite a bit due to the latency.