What is risk?
That makes sense, even if being aggressive sometimes gives you a little benefit, whenever you made a decision mistake because of unavoidable classification failures, the loss is great. So the line should be set far from danger, and even if one go beyond the line a little bit, it’s still fairly safe.
Although sometimes go beyond the line a little gives a little gain, still being fearful is the price we pay for uncertainty, and actually helps us being safe and successful after all.
In melee, being aggressive in the start of the game, gives you the benefit of 'cleaning your neighbourhood' and therefor can give you a relatively safe area when you survive till the last 4 or 5. Plus the bonus of doing a lot of damage. Then the conservative strategies kick in, like trying to never be the closest to anyone else and saving your energy.