As I recall, the warning about overuse of Latin derives from Fowler and goes through Strunk and White (might be mistaken about the latter), where I think the contrast is drawn with words that are described as being more "vivid."<p>I stand corrected on having used "punchy" in a way that appears dismissive. I am in complete agreement with the rest of your analysis as well, including with your admiration of Mr. Zinsser.  Believe me, I spent years trying to master style, and I highly value the guidelines put forth by Mr. Zinsser and others to assist in that process. As long as they are not treated as rigid rules, they are most salutary (or is it healthful) for our learning.<p><i>Gratias tibi ago.</i>