The point is that traditions, especially long established traditions, generally do in fact contain good advice.
That tendency exists, and is part of why I'm confident the thing I described as a bizarre alternate universe wouldn't really happen, but it seems as true-but-irrelevant as the simple fact that such a tradition probably wouldn't develop.
I realize this question is contrived, but I figure it might provoke some fun discussion, so here goes:
If you could push a button and have your brain modified to precisely remove a cognitive bias (and have no other unnecessary effects—most convenient possible world), which would you choose? Why?
What if you were choosing for the whole human race?