Comment by aerostable_slug

Good point.

OTOH, for me the Quest killer app is Ace. I can practice pistol shooting any time I want, which keeps me using the headset every day. For the glasses, the killer app might be translation. Now, I couldn't say if that will 'translate' into widespread user retention, or — like Ace — only really keep a smaller community engaged (I don't think most users need translation services on a regular basis).