How is this Balanced? (Bard)

[kensatsu]

let bard free to burst can be a mess, btw if he got the defense buff how to manage this.
tank will certainly try to get to harrase healer and 2 dps will focus one in most of the case, in this case virus, stunlock. eventualy bump, bind when is close because he still have to be close to deal big damage.
You can let anyone free to do as they wish, especialy when everybody is doing opener and when burst is back.