Positionals are not only a melee thing. They involve the entire party, particularly the tanks, but it also depends on the specific boss. You do require everyone to work in some way to get them all in fights like P11S.
As for normal duties such as alliance raids, the main issue is normally tanks trying to reposition the boss middle and looking north all the time when it's not needed. Unless the boss absolutely needs to be there, it's not required to rotate or move it. Just wait till it teleports itself or move it only when required. Rotating the boss fast will also mess up with positionals.
While missing them is not a huge loss, it's one of the few optimization options left to melee so they should not be removed. Whether hitting them should yield more DPS than they do now or not is another question entirely though.
This would be extremely punishing due to Raiden Thrust's scale generation. They're not going to go back to this and if they did, they'd have to compensate for such a high failure state that can be out of your control in disorganized groups, mostly relevant for PF Savage and Ultimate groups. And I doubt they'd do such compensation for DRG.
