Do you think they are necessary ? It is useful when you are into aggressive planning. I am not sure whether we should use it in case our method of dealing the Google specific metric isn't aggressive. Because Google is very good in its " automatic " mode.
Before (years ago) SEO was something that was need for page layout and structures. Now it’s really about unique content more than anything and a bunch of SEO aspects like html pages vs.dynamic aren’t even that important anymore.