Originally Posted by BoredGuy
Maybe purely for battle, being that's all she dealt with in Avengers
but the spy/espionage part of her job often relies on blending in/flirting/using her attractiveness to her advantage
For those situations, the long hair would be more ideal
besides, she could always put it up in a ponytail or something
women are resourceful
Well, she's gorgeous regardless of her hair style. However, once again we're back on her looks, rather than her skills as an actor or her character.