I must not be communicating clearly this evening. What I meant was, (somewhat tongue-in-cheek) similarly, calculus grants us deeper understanding of otherwise confusing mathematical/physical/etc systems, but is far too tedious to apply to life every minute of every day.

As for 'root mechanisms', perhaps "mechanisms" wasn't precisely the right word, but it's up there with game theory. It is typically applied to animals observed in nature- yet that said, we too are animals, and it takes but a moment's thought to recognize it in action among humans.