After a week of reading your posts, I would expect a better response.
My initial point was to focus on on-page content, by utilizing the diagnosis and keyword density tools on SEO Quake as one of my preferred tools without the use of developer tools.
As Matt Cutts stated in the video, there is a law of diminishing returns when dealing with keyword content. And absolutely there is. So, if there is a law of diminishing returns, there must also be a law of increasing returns. Correct?
I respect your opinion and appreciate your feedback. But not the type of feedback that puts down another person for their opinion. You make good points, but a weak argument on why the metric is flawed overall.
A better discussion would be how does too much keyword density effect Conversion Rate Optimization? Or how a keyword density tool differs from a TF-IDF calculation.
All in all, its been fun. Agree to disagree about pieces of you perspective. And I'm sure the feeling is mutual.