It sounds like they didn't do a good job of putting the DIMM version in the hands of folks who'd write the drivers just for fun.

The read path is sort of a wash, but writes are still unequalled. NAND writes feel like you're mailing a letter to the floating gate...

Isn't this addressed by newer PCIe standards? Of course, even the "new" Optane media reviewed in OP is stuck on PCIe 4.0...