Not good enough in most segments
As a persistent memory architecture it was just not fast enough and useless in large virtual clusters where you have no idea where the VM is likely to restart. So is was really just a bare metal solution only.
Memory hungry applications tend to be memory bandwidth and latency dependent, so to get the required performance you ended up having to run in a 1:1 DIMM to Optane configuration.
As a storage solution (sitting on the PCIE BUS) is was far too expensive and again was local to a physical machine, so at best it was a good caching mechanism before writing to a fast remote storage device, but then again, an array of fast nvme drives would have been just as fast and cheaper for the same capacity.