The thing with the mobility was, pretty much every other job has a combo dmg stacking mechanic, but had they ever needed to move to avoid or reposition they'd run the risk of losing their place. Bard practically has none of that save for Straighter Arrow procs but they can maintain max damage while being able to easily reposition themselves anywhere. That, and since songs have a limited range you'd have to be able to follow people in case they just decided you had cooties or something.
The whole shoving mobility aside thing now really irks me. Seems like putting unnecessary new "tactics" on the Bard having to be particular about positioning, when they were the only class never having to worry about that. So just forcing this process of casting times on us is messed up. Yes, they can still move while under Minuet's effect, but maintaining maximum damage output like now will become impossible. They could have at least made it so you move slower while charging your arrows.