Esker
Hero
To be fair, DD is triggered on a hit, not an attack, so if you have a decent AC, that's the equivalent of maybe 2-3 attacks worth of flat bonus.
Yeah, good point.
But on the more general topic, to me the battle maneuvers and flourishes seem to only be cosmetically similar. The flourishes are more just bonuses as numbers. The maneuvers are more about inflicting conditions or new opportunities. The former is a buff, the latter more control or debuff.
I dunno, Slashing Flourish is very similar to Sweeping Attack (slightly better, since you get the bonus damage twice: once to the main target and once to the secondary one), and Mobile Flourish is very similar to Pushing Attack, only better b/c there's no save (the push isn't quite as far, but I'll gladly take that trade), plus you can follow if you choose. Battlemaster has options that could make them fight similarly to the Swords Bard; but those don't tend to be the bread and butter maneuvers that Battlemasters use often. Meanwhile, Swords Bards tend to use Defensive Flourish, which is just a buff.