That's probably an accurate description of the median item of advice. But there are people who are good at advice just as there are who are good at math or writing. The recipe of the best advice = limited life experience + great perceptiveness.
Life experience is always limited (almost by definition). You've only lived your one life. Broadening your experience is generally a good thing, but it's still extremely limited. In general, people can't even comprehend how limited their perspective is.
