That's interesting, I didn't see anything about a grade which is kind of what started me on this line of thinking. Having the ability to make sure a pug is at least "S" ranked for raiding wold be a huge help to a lot of people and for people wanting a basic benchmark of their abilities in relation to theoretical dps maxes for their class would take care of many of the reasons the average player turns to parsers. Hopefully the ranks or grades are a good representation and not overly lenient so they are actually useful to people.
edit:
I would love for the system to be robust enough and useful enough to curb the parser abuse by people who are using the numbers in isolation as a way to judge people, and creating an unfriendly environment. As you illustrated they are very powerful tools when used correctly, but since they were originally created for more hardcore players to min-max they aren't a tool that offers much needed context for those non hardcore players who are also seeking a way to improve their play. Having a tiered system of nothing->proving grounds->parsers may help with that which would be great for everybody I think.