Free Trait Theory holds that people can, and regularly do, act against their natural temperament for the sake of "core personal projects" they genuinely value — an introvert can convincingly perform extroverted behavior for a cause that matters enough to them, and vice versa. This is a genuinely useful reframe: temperament isn't a hard ceiling on behavior, it's a default setting that can be deliberately overridden for good reason.
The theory comes with a real cost that has to be managed, though: acting against your natural temperament, even for something you value, draws on a limited reserve, and sustaining it without adequate recovery time can produce real burnout — meaning the skill isn't just performing against type, it's knowing how to build in recovery afterward.