I think HW BRD was a bowmage mostly because MCH was designed around Gauss Barrel adding cast times and damage and they thought BRD would be imbalanced comparatively. It worked better on MCH, as it was given more buttons that allowed it to move freely and even buttons to guarantee it could move freely, while BRD had to rely on a proc that it could not overcap or control, and limited movement even further with an oGCD weapon skill with a cast time (Empyreal Arrow, which specifically actually felt great because it was so much stronger and chonkier than the rest of BRD's actions at that point, comboing with Barrage, too, but I digress).

This was removed wholesale from BRD but not from MCH until ShB, as MCH relied on Flamethrower to control its central heat gauge mechanic in StB which required planting its feet for a bit like Ten Chi Jin. Very little reason for Flamethrower to exist now.

I'm just pointing it out to bring up that having some cast times or mobility constraints shouldn't be completely tossed. Playing BRD and MCH in PvP, they do actually feel like they hit much harder and the cast while moving actions are satisfying to use. Give em a try at least at the wolves den if you never have. Not saying they all need it, but it's a potential solution to making the three pranged feel more diverse in how they play in between burst phases.

I remember older fights definitely had more for pranged to do as they tended to have more mechanics centered on a single player that the team could control with movement which allowed them to excel at as they had no movement constraints. T7 was already brought up as one that happened often enough that you couldn't just tank cheese, but there was also t8 guided missile tether (even Brainjack could be solved by pranged if you wanted to solo tank it), Ramuh Extreme always targeting the furthest player +1 not aggro target with Chaos Strike, things to interrupt and heavy, even bind in some places (though that was basically never necessary even in t7).

I'd say give pranged more unique support to the party. MP, TP and enmity are basically gone, and everyone and their mother buffs damage of the group now (and even heals and mitigates it), so also give em like... I dunno, group wide True North, Arm's Length or steal Expedience from SCH. Let them support the party in whatever way they can, and let em do it in ways they are different from each other. Maybe DNC also shares role actions with its partner and whoever temporarily gets Espirit. Let MCH toss out turrets that pulse the effects like Bishop did. BRD's songs could be given more freedom to cycle (they're rigid now) and just carry additional benefits, or they could be given unique songs with those effects. Go nuts.