If someone learns properly, it should refine his thinking and emotions so that he can answer a question with seichel and objectivity. A true gadol does not allow bias to inform his decision, and has insight (to varying levels, depending on the level of gadlus) that a hedyot doesn’t.
So it’s like a Yogi (not Berra) or Bhikkhu (or Bhikkhuni) or perhaps more like a Vulcan (think Spock), who can make decisions based on logic and (Torah) knowledge and not allow emotions or biases to taint their opinions.