Optane performs much better at low queue depths which accounts for many common workloads, and has better power usage at these depths -- this lets it compete with NVMe at the same performance for many tasks with a smaller footprint (e.g. battery). It's not all about peak GB/s, though to be fair not even Intel's blurb makes this obvious...

That said it's quite possible NVMe drives will be "good enough" where PCI-e Optane never makes major inroads, even just in terms of pure volume. The dollar-per-GB needs to come down a lot, still.

Optane in DIMM form is also still MIA. I'm extremely skeptical it will live up to the original hype it was put through ("thousands of times faster") but I imagine it will be able to outclass many competitors.