If you only measure blockers as an index for productivity then two teams with the same number of blockers should always have the same productivity, regardless h

If you only measure blockers as an index for productivity then two teams with the same number of blockers should always have the same productivity, regardless how the people are? I cannot fathom how wrong this “measurement” can be. Yes, reducing blockers is important but that is not be the only thing the world cares about.