Brad does an excellent job of framing tradition in the Protestant tradition. Just as virtually no one would try to chart a course across rugged terrain without a map, so too the accumulated 2000 years of reflections by intelligent and deeply committed Christians provide us current day Christians with the lay of the land, which can greatly shorten the time it would otherwise take to get to our destination.
In other words, theology is best done as a group activity and honoring one's theological forbears means making them part of our group.
In any event, don't believe me. Listen to Brad.