A flexible equation...

Flexibility, apart from possibly being a positive trait, could also be a mask used to hide one's inability to choose. Inability to choose could occur due to one's lack of vision(of choices), but could also occur due to the inability to take responsibility of a possible failure. And even after the choice has been made, this fear still lingers, which further aids to the failure of the choice and brings one to the very obvious conclusion: "Grapes are sour".