As a counter argument - the best person to know you is you. We all owe it to ourselves to learn how to debug our own bodies and minds. They're all different and

As a counter argument - the best person to know you is you. We all owe it to ourselves to learn how to debug our own bodies and minds. They're all different and achieving mastery of a particular one can only be done by itself. The benefits of this are numerous in that you become predictable to yourself. You know how you'll react in situation X and that if you do Y at Z time you can avoid mental state Q. A shrink won't be able to tell you that. As a counter-counter argument, the truth is in the middle. There's a lot of collective wisdom and knowledge on these subjects and a lot which can only be discovered independently. A hybrid approach is head and shoulders above either one in isolation.