While dalmatica does not play to BRD's abilities, it is quite useful in many endgame situations. BRD isn't just a singer, they are a support job. The extra Erase, ~na spells and curaga IIs from bards shouldn't be overlooked, as that support can win a fight, or help make hate management a lot more stable. As in exp, brds rarely get to rest, and they can't have ballad on them all the time (I'm sure you knew that already, but...). Also, when comparing Dalm to V.Cloak... dalm allows bard to wear their hat, which allows them to have refresh on all the time.
The dalm bards I know have no decrease in performance when it comes to landing elegy, so obviously they aren't hurting their job by losing that potential 10CHR. AND even if it were an issue, offensive songs cast very quickly so you could easily macro in another piece for the offensive song nad than go back to dalm for buffs and curing. in short, dalm is a very good piece for brd, probably the best in the game for endurance fights. I don't understand why people were saying otherwise.
to OP: Osode does benifit brd, but there are many alternatives as you pointed out... and most are generally considered better. It wouldn't hurt to put them over the everyone else category i guess, but... they probably shouldn't be first in line.
He was talking about better pieces by priority. I understand the applications you're talking about and I agree with you in those instances, but it is exactly as I said: utilizing the bard's sub more than the bard's main, which, yes in certain circumstances is necessary. I can think of much better uses of a dalmatica than for a bard is the point I was trying to make, just as the same can be said for osode.
As far as in exp, with a mage worth their salt, and with me doing my job correctly, I don't need a refresh effect more than ballad. A good bard can manage their mp in an exp situation just as well as a mage main.
So yeah, I guess dalmatica if you have problems somehow keeping your mp up as bard, but... I've yet to have that problem and I've never had a dalmatica.