Pretty much, he seems to talk about things from their theoretical perspective an awful lot, rather than their actual application in the gameplay.
And that is because the developers cited that Melee Engagement was added to solve a "problem", refer yourself to Kickstarter Update 44: Melee Engagement. It was not added just to "try a new mechanic".
If the backers did not complain about Aggro mechanics in MMOs, then I think we would have one of those systems instead. I'm glad we don't though.