This is amusing since Intel seems to be sort of going in the other direction lately: their efficiency cores are becoming more like their performance cores with each new generation (at least in so far as they are getting wider and more capable of higher clock speeds), and there even seem to be some rumors that the two design trains may get "merged" in the future.

It's interesting to hear indeed. The 6c's improved latency hiding might be intended for use in extremely high core count Epycs, which have lots of memory channels, but not many at all per core.