Leave bubblestun to the healers as your shearing top end damage to get it while not having the cd/force pool to keep it up on others means you can be disregarded as something a bit above a mosquito in someone's ear, then when the real threats are taken down toy can be freely focused
Would be a perfect idea if there was any grantee that you'd have a bubble-speced healer. Reality is that often you'd come into WZ without one and then you'd lose a major survival tool. What you give up is not really that bad either, the most important talents are rather far down the trees and the telekinetic tree has a lot of nice candy that creates a good hybrid spec.