As a product manager, I am frequently confronted by UX people who declare something as „standard“, a feature that is supposed to be an absolute „must-have“, or else our organisation would loose even the last of our users. Unfortunately, developers tend to accept these things as interesting challenges and (knowingly or not) underestimate the effort and complexity needed to implement it.
My very lonesome role in these cases is to insist that this shiny thing is no standard at all and that our users would be quite happy without it.