A mathematician from the UK destroyed the premise behind the Positive Psychology movement's metrics to happiness. And I've noticed a lot of famed philosophers and psychiatrists call B.S. on positive psy and the 5B dollar industry that comes with it. But in the end, do you become a realist grouch or a naive positivist. Well, if you raise kids, the latter.
People forget that psychology is the softest science. Anyone can say anything and few of the ground-breaking studies can be replicated. That makes it great for the coaching and psych industry, but not so much for the patient. Only the most qualified and experience should be used. And psych advice from random non-professionals rank. That's scary!