Preference != Aptitude. Thinking in maps can help clear up another misperception that comes with labels like "thinking" or "feeling" — that a feeling type is more emotional and a thinking type more logical or serious. That may sometimes be the case but overlooks that our preference for one tool over another doesn't indicate our skill in using or expressing them any more than being left or right-footed makes us a better or worse striker. Some people who prefer thinking can out-feel another who prefers feeling. And many people who prefer feeling can out-reason a "thinker" in a debate. Exceptional people are often more adept than most of us in multiple functions regardless of their preference.
Something to look out for: a well-develop feeling function is better able to moderate and channel emotions appropriately. Whereas for many thinking types, the emotional landscape is relatively foreign territory — it’s a space we prefer to avoid. When we’re less adept at navigating feelings we’ll have less of a handle on our emotions and express them more strongly and overtly than a situation warrants. So overexpressing emotion can be as sure an indicator that we’re a thinking type as under expressing them.