This is true. However, a BM monk is the best dps to target call in the current meta, because they can time hardswitches off of their keg smash cooldown, and therefore are very effective.
I don't disagree with you on the first statement, yes anyone can call targets. but if one BM monk is calling targets for a team and landing kills, while the other BM is not being
as effective at focusing burst, it is an indicator of the usefulness of the BM. I am not saying that throwing barrels takes skill, I am saying that coordinating burst focused around one of your class abilities takes skill.
You explain my point even more. In my opinion, I do not think that anything should be banned, unless it is extremely overpowered and gamebreaking. At this time, BM monks are not extremely overpowered to the point where they become a problem, and therefore should not be banned. If BM monks were hitting 5k aoe kegs, we might have a problem. However, fortunately that is not the case