I think it is awesome Carmack takes the time to do this. He clearly cares about VR and the experience users have with VR, even on seemingly trivial apps such as

I think it is awesome Carmack takes the time to do this. He clearly cares about VR and the experience users have with VR, even on seemingly trivial apps such as this one. I imagine most developers in this space would love to be peer reviewed by Carmack. Some of his comments seem to be nuanced rendering suggestions, I'm not sure anyone with a 'bit of technical knowledge' could provide this level of feedback.