The controversy about metriopatheia and apatheia, which generated such heat in later Greek philosophy, is one between the concept of a bipartite or tripartite soul, in which the lower part of parts can never be eradicated - at least while the soul is in the body - but must constantly be chastised. In practice, Stoic eupatheia in practice is very similar to a properly moderated Platonic-Aristotelian pathos, but that is irrelevant to the main point. We find in Plutarch and other Platonists of the period a remarkable unwillingness or inability to comprehend what the Stoic position was.
Dillon, John M., "Metriopatheia and Apatheia: Some Reflections on a Controversy in Later Greek Ethics" (1978). The Society for Ancient Greek Philosophy Newsletter. 27.