After they proved they could make it work mechanically in RDM and SUM, I think it's time Bard benefitted from the programmers' ability to make morphing buttons.
1) Straight Shot/Refulgent Arrow is insufficiently advanced over Heavy Shot/Burst Shot to warrant saving a proc for burst windows.
If we accept this, we see that the only reason to have them on separate buttons is so that the job feels like it has a little more going on prior to level 12. If it weren't for macros' inability to preload, a "Straight Shot, Heavy Shot" single macro button would be mechanically identical to having the two buttons.
I would propose - with the assumption that higher-level potencies would be moved around to make this fair mechanically - that at level 2 Bards don't get Straight Shot as its own button.
Instead they'd get a trait - Straight Shooter - causing Heavy Shot to turn into Straight Shot 20% of the time.
And so that they have more than one button to push they could get a 20- or 30-second CD Ability that just gives them a free proc. This gives the Bard player a little boost they can use during burst windows; A mini-Flourish, as a treat. They'd basically use this the first time after CD that they don't already have a proc, which means for optimal use you couldn't shove this option into a one-button macro the way you can with Straight/Heavy Shot.

2) Along similar lines, The Wanderer's Minuet and Perfect Pitch shouldn't be two buttons. TWM should just turn into Perfect Pitch on cast, and turn back when the song runs out. You'd need the CD for The Wanderer's Minuet to count down in the background (or calculate 75s+[time left on song] when the song ends, I guess) but the devs have shown they can handle that kind of thing well.

3) At present, the way Barrage works only gives you the opportunity to press the wrong button and reduce its value. There's no situation where you want to spend Barrage on anything but the exact weaponskill it activates on use. This means Barrage should simply be a GCD Weaponskill that fires three hits equivalent to that of Straight/Refulgent, or that on use the button turns into Straight/Refulgent to minimize the odds of hitting the wrong thing.
The other direction to go design-wise is to give Barrage a separate option; a superior Weaponskill that's only usable every two or three Barrages, kind of like how extra Kenki goes into Shinten once Senei is on CD. At that point you'd use Barrage-"Super Shot" for the first burst, then your free Refulgent on your next GCD, and on your next Barrage cooldown you'd use Barrage-Refulgent.
At that point there'd be a worthy reason not to make Barrage into just a Weaponskill. But unless that's in the cards, it really ought to be.