"Should someone who studies Epicurean philosophy also include the study of modern psychology and implement evidence based "self-help" and positive psychology"?
I agree that there's not an ultimatum to or prohibition against the study as Pacatus 's last sentence states.
However, Kalosyni , I think you've hit the nail on the head by using "evidence based." If a technique or practice is shown to increase happiness or enhance gratitude in keeping with Epicurus' philosophy, I certainly see no reason to not take advantage of it if it resonates with someone.