But why would you want to wear something like this, for that? I can see how an editor/IDE plugin might be useful (a la racer for rust etc) - that would update a section of the screen with tips - but I don't think I'd like to have this on a completely different device.

Now, with a full vr headset, it might make sense to be able to place such things outside of the normal field of vision (where your text/code editing resides) - but so far I don' think working full time in VR with text is a great idea, with the current generation of headsets.