I've also seen Optane recommended as cache for ZFS pools[0]. I wonder if Intel is sufficiently disillusioned with Optane to license it to another manufacturer. Particularly with the CHIPS act in place, perhaps there's room for someone to take another run at it.
I'd love to see Optane used as the basis for a non-volatile OS. Unfortunately pretty much all our substantial software "needs" to be restarted occasionally, so a non-volatile system is not so practical :(
[0] https://www.servethehome.com/exploring-best-zfs-zil-slog-ssd...