Problem with what you posted. Is that its just an image. With no other information. I was just expecting a webpage link.
It says dps, but doesnt show whats personal and whats including raid contribution from TA, Lit, etc. What comps they are in, is anyone buffing numbers etc. Id assume the 95th percentile is higher gears, more efficient comp etc. But doesnt SHOW us.
If this is showing us the factored dps (personal dps plus what they provode to raid added in) then it actually shows disparity.
Lets take the two lowest melee on this chart. Who would you bring? Sam or Nin? Off this chart, sam, because if this is rdps, then the nins contribution is already rolled into their number, and shows that even after "helping the raids dps" it provides less rdps overall than a sam. Nin has no other use than trick, which doesnt increase rdps past what a sam can selfishly do, so NIN isnt wanted. This is also a high movement fight, which im assuming is why all the non melee are so low, because none of their numbers make sense for how strong they do in a more stand and dps fight.
A NIN according to your chart would not help anyone clear a raid any faster than the other melee. Ranged do a lot more damage than this on other fights. NIN doesnt have any other reason to do less dps anymore, as even factoring in rdps, they still do less. No benefit from dps stand point (trick is just to make your numbers bigger tho not killing things any faster as a whole) and no other tool kit to warrent the "utility tax"
Maybe higher gear tiers will male up the difference, but there is a reason MOST are upset with the way NIN is.