Of intel wanted to stay in competition, they should support optane Dimm in mainstream. Imagine 32gb ram + 64Gb optane Dimm.
Intel needs something to go up against Threadripper Pro and the inevitable Zen 3 Threadripper in the HEDT/workstation space. Optane DIMMs could be a very useful weapon here.
Intel can't do anything about the 64 cores/128 threads they are up against but native level 4 cache in the form of Optane DIMMs could eliminate a bottleneck that AMD has no options against.