Asserting their importance and universality implicitly teaches that they are salvational, that you get to heaven by practicing them. They constitute only one subjective preference among many, like a taste in foods rather than like the principles of anatomy. They rest on an outdated, simplistic psychology. Wisdom is only a subjective habit of mind rather than an insight into objectively existing things. Courage is a specialty for soldiers rather than a necessary aspect of every virtue.
Moderation is cowardly rather than passionate.
Moderation is dull. Justice is a mathematical, impersonal, calculating thing rather than something intuitive like musical harmony. Justice is only external and social. Justice is necessary but unattractive, like a medicine or a law. There are many more misunderstandings, of course, but it would take a whole book and the demolition of the foundations of the modern mind to explore them all.