Insight, in those who actually recognize same, doesn't change our own behavior because we save our best insights for those around us.
Behavioral advice is appreciated by no one more than the giver.
Still, some insights can be, well, insightful. I don't know what's happening, I'm so rushed. And getting the kids back and forth to the doctor every other day is such a production. People who live to be old rarely visit physicians. Therefore, avoidance of doctors should, by some wild and illogical digression, prevent death and disease.