I think the lines between a practical philosophy, a religion, and a psychotherapy technique are pretty blurry. In ancient Greece and Rome, people would often identify with a philosophical school in the same way people identify with religions nowadays, choose them based on the practical benefits, and practice them as a lifestyle or religion (instead of just conceptual understanding).
I don't think it's mysterious or hard to predict where techniques from a philosophy or religion will be useful in real life, and where they will not... it's pretty easy to understand what they are, and how they apply. Modern therapy techniques like CBT, ACT, and Mindfulness therapy are pretty much just extracting these ancient ideas and practices in a systematic way, so they can study the effects clinically and actually be able to say in which real world context they are reliably useful.