How is this different to just summing estimated value and variance? I agree with the author that agile world zero effort estimates are pointless though. "...

How is this different to just summing estimated value and variance? I agree with the author that agile world zero effort estimates are pointless though. "... engineers determine it by licking the tip of their finger and putting it up in the air. Unfortunately, the only way to win at the estimation game is not to play it." "