It's nice to think about how this kind of data could be used, but with anything like this we have to consider the UX impact of making it a higher-effort interac

It's nice to think about how this kind of data could be used, but with anything like this we have to consider the UX impact of making it a higher-effort interaction, as well as the observer effect: https://en.wikipedia.org/wiki/Observer_effect https://en.wikipedia.org/wiki/Observer_effect.