a lot of people were scratching their heads on how to put optane to use. a fast ssd? or a slow DRAM? with a propietary api? and requiring support from the hardware platform? the whole product line was inconsistent as they use the same name for both storage devices and NVDIMM.
What do you mean by "nobody"?
Significant % of top 500 fortune used it
Not enough to stop Intel from killing it. Had they been using it seriously at volume this would not have happened.