interesting point. the problem is that no interaction means no data. and along the motto "if you can't measure what's important, you make important what you can measure" a more concrete metric needs to be used. even if - ironically - the optimization is opposed.
I was going to use that motto for a completely different email with my faraway manager but I found that the more popular version was "Measure what's important, don't make important what you can measure." It's attributed to Robert McNamara https://www.azquotes.com/quote/613247
sure but if you optimize you have to optimize towards a number. Now that number is either 0 in this case or x which is close to zero. Now which x would you choose? And if you choose an x (let's say 47 minutes and 23 seconds) you'll lose data moving towards it.
