So after waiting for about 2 weeks to see the consequence of homogenization

[Duelle]

So... Bard had single-ally-shared buffs that would be mutually exclusive to the identity of Dancer?

Dancer getting significant support in no way means that Bard had to lose its own and end up as a 'Machinist w/ less pDPS in exchange for Battle Voice'.

I was surprised when I saw the song buffs BRD got with SB were taken away this expansion. If I were to hazard a guess, someone on the dev team wanted to avoid raids feeling forced to have both DNC and BRD. I don't think that would have been utterly broken (unless their internal tests were showing a DPS partnered with DNC + BRD's 2% critical hit song bonuses and Foe's debuff somehow yielding insane DPS), but it's the only explanation I can come up with.