For clarity there are 2 types of AoE spells:
- Targeted AoE spells are like you describe where they can land on up to 4 mobs and the AoE area is based on the target the spell/song lands on
- Point Blank AoE (PBAOE) spells/songs land on up to 25 mobs and the AoE area is based on the caster.
PBAoEs are not unique to the bard class, there are several classes that have PBAoE spells and could effectively kill mobs in groups of 25 at a time. Fear clearing comes to mind where groups routinely burn down mobs in groups of 25 in seconds.
People always make the argument they should go to a different zone, there are other places to swarm...well guess what, there are other places to EXP too. The other person could make just as strong of a case of why YOU should be the one to go elsewhere, nobody has more or less right to a zone than someone else.
Any zone you suggest that is the perfect zone for swarming in your mind you could search in this forum and find a thread about how bards shouldn't be able to swarm there and go somewhere else, the reality is people are going to go to the places that they can accomplish what they are trying to most effectively. That makes you and the bard you're angry at no different from each other.
The reality is this is just another of the same thread that repeats itself daily on the forum. A thread about entitlement. A thread about why I should get to have things that you shouldn't. A thread about why you should spend your time doing what I think is best for you, not what you think is best for you. Take it out to the extreme and the same points made in this thread are the same reason that casters shouldn't be allowed to cast spells, that healers shouldn't be allowed to heal, and that melee classes shouldn't be able to engage mobs at melee range. Its all nonsense.
Heres a really crazy idea that actually works! If you don't want other people killing mobs around you then keep all the mobs around you dead. You can't pull stuff that isn't there, you can't kite in an area that there is nothing to kite. Give someone an opportunity and they will take it. If you want to spend your life crying about other people taking advantage of opportunities you give them well then it sucks to suck and life is going to be real hard for you.