It's 4k per eye. That's great compared to current headsets, but please remember that the screen of your normal screen likely already has 4k, and that's just a rectangle a few cm of everything you see. The 4k per eye means that it's likely going to be <fullhd depending on just how gigantic you want to make the screens

It could be great, but productivity will likely need over 4k per eye to be anything beyond a novelty.

Depending on how the hardware develops, it could become something great for sure. most people calling it a novelty are taking about the device as it's been announced, not the theoretical future it could potentially have if it was different.