It's too tempting to optimize for what you can measure, not what's actually valuable (for your users). "User engagement" measured in "time spent on page" may ju

It's too tempting to optimize for what you can measure, not what's actually valuable (for your users). "User engagement" measured in "time spent on page" may just mean the page is necessary/useful enough that the users suffer through a miserable layout. See also Goodhart's Law: https://en.wikipedia.org/wiki/Goodhart%27s_law https://en.wikipedia.org/wiki/Goodhart%27s_law