I think a lot of people are misunderstanding things.

A Bard and Machinist's main duty is to provide a below average amount of DpS and increase the group's average DpS through TP/MP Regen and a Physical or Magical Damage boosts. The combination of the below average DpS and the DpS gained by others through TP/MP Regen + Foe Requiem/Hot Shot is supposed to allow them to provide roughly the same DpS as the other ranged classes.

Average DpS comes in 2 states "Mobile DpS" and "Stationary DpS." All classes were balanced during 2.X around only Mobile DpS. When Stationary DpS fights such as The Avatar were added, problems started appearing as Bard Mobile DpS and Stationary DpS are the same while every other class has a sharp increase in DpS between Mobile and Stationary.

Wanderer's Minuet and Gauss Barrel are intended to rectify this difference in Mobile/Stationary DpS. The problem is that these abilities were overbalanced and ended up not providing the boost in Stationary DpS they were intended to. Perhaps the best/simplest way to fix the problem is to increase the amount that WM and GB increase damage by around 15% of base damage.