I agree, it’s not a fair comparison. Melee has to run out and heavy dot dps benefits more as their damage can tick while running out for Consume/Expunge.
OP there are better fights to base this on in the raid. Also like other posts mentioned, why pick max percentile which has less data and people who cheese mechanics to maximize dps for parses.
Also not sure why the state of shock by the OP? DPS has never been evenly balanced, there is always disparity and it changes from patch to patch. All classes (with exception of maybe warrior) have a dps spec that puts them atleast in the mid-high portion of the dps chart.