This is not much of a reply. We can disagree on the superior class for their roles and still conclude that bard does not need root.
I ambushed a bard/VW duo while the VW was chasing a wizard. Bard gets off mezz, I purge, I am right on him but not able to rear snare, he SOS, then turns and roots me for 1 min+. I just stand there as he heals himself and waits for VW to come back. VW doesn't return before root is over so he just mezzes me again. VW comes back, I almost win the 1v1 before bard heals (as he should) and I lose. Any other healing class would not have SOS to get away and any other class with SOS would not have that amount of CC and/or the heals to save their duo partner.
The class just has too many tools that make them too strong in small man and 8v8. Zerg fights their insta aoe amnesia is a bit much, everyone else has to at least cast theirs hence the call for a longer CD. Biggest issue is the root and a minor issue that would help is the longer CD on insta amnesia.