So true. This message has to come from the CEO and be modeled by the CEO. Without a mindset that only 1/10 ideas are likely to have merit, getting effort estimates on not-yet-validated ideas (which may not even relate to goals or customer problems) is an expensive and demotivating waste of time.
… moving quickly is so important that we were even willing to tolerate a few bugs in order to do it. What we realized over time is that it wasn’t helping us to move faster because we had to slow down to fix these bugs and it wasn’t improving our speed.” — Mark Zuckerburg