Your point is a major factor in why Merc dps is considered OP by the devs. Not so much the issue of what happens when devs play devs in their free time. But just generally, a low skill Merc dps will own a low skill Melee dps. The low skill melee dps can't keep his target in front of him and in range. He might lose 50% or more of his GCDs simply to target acquisition. The low skill Merc dps has a significantly easier time here. And thus he will post better numbers in warzones. But once you get to skilled players, that melee inefficiency is dramatically reduced. Instead you get a lot of lost GCDs to the Merc dps through interrupts and lost dps through better defensive abilities available to the melee.
Basically, the Merc dps subclass benefits from a very easy learning curve and is thus penalized by the devs with an artificially low ceiling on performance. It's bad design.
exactly. which is why balance changes should never be made in terms of the lowest common denominator. bioware has made this mistake multiple times now