Personally, I prefer it to be GCD. Too many Bard animations get clipped off half-finished as is. I'd just prefer it have a stronger potency floor and, ideally, a bit higher a maximum, too. (Honestly, 1000 potency or even higher wouldn't be remotely out of the question; pick smooth floor and per-gauge potencies and see where it ends up.)

Bard's presently underpowered. If it doesn't make Bard leveling suffer too much to allot it some of its level-80 strength only to its capstone ability, then I can see no better place than Apex Arrow to place that missing rDPS besides perhaps some more active support skills (ideally, replacing and doubling down on the recently returned lackluster passive support).