I don't understand why Optane hasn't been revived already for modern AI datacenter workloads. Being able to augment and largely replace system RAM across the b

I don't understand why Optane hasn't been revived already for modern AI datacenter workloads. Being able to augment and largely replace system RAM across the board with something cheaper (though not as cheap as NAND, and more power-hungry too) ought to be a huge plus, even if the technology isn't suitable for replacing HBM or VRAM due to bulk/power constraints.