i think BW did not taken into consideration, high alacrity builds and how it could affect specific classes: concentration/fury being one of them, so the result is a higher parsing class, but i am yet to see the practical results on operation bosses.
in any case, pure raw numbers the OP is correct - there is no reason to play watchmen/anni, due to the fact that the other 2 specs seem to be parsing higher then intended.
:offtopic:
it must be me, but i am using high alacrity build on my concealment and having good results, but on lethality not so much. can it be that only high alacrity builds afect only burst classes optimally?