Current reliance is looking up what a classes current rotation/s is and when to best utilize them. A parser is only good for those that are willing to utilize said feature and actually >>study<< the data, key word being study. With gear inflation people will see their numbers rise and just figure that they're doing fine, but ultimately they'll still be required to know what their class should be putting out and at what ilvls. So what's the point? Either way some things will have to be looked up.

Just stick to the current model of knowing your rotations. Let those wanting to use third party parsers do so, as long as they keep it to themselves. Including in-game parsers will most likely only push the community into toxic areas, WoW being a perfect poster child for that fact.