An important part of INTJ maturity is accepting that their own approach may fall short and examining the basis of other beliefs regarding the system or framework they instinctively favor. Or just learning why the lack of adherence to such a framework might be acceptable. INTJs, for example, are urged to learn about different personality preferences so they don't grow impatient with just about every other type. It's easy for INTJs to wonder why their ENFP friend just won't act logically.
In the case of the INTJ, the role of extraverted thinking, commonly called systems thinking, is crucial: It can replace their instinctive (and at times compulsive or otherwise destructive) emotional response to circumstances that make them feel anxiety. So when a more mature INTJ is feeling anxious about a situation or circumstance, they usually fall back on their extraverted thinking to help them examine rationally and build a model around it. Otherwise they might find themselves falling into compulsive behaviors, losing their grip on the situation.