Bit of a disagreement there, since I do believe that BRD is a supporting kind of class first and a DPS second - in solo content or dungeon runs, using Refresh and Foes whenever it suits yourself is fine enough, but you should definitely not do so in prog. It's a better idea to watch out primarily for the healers' mana bars, in my opinion at least.
I think RLofOBFL's response nails down the basics, but if you want to do some more research, you could check out this bard guide:
https://www.mooglemedia.com/brd-guide/ or, alternatively this one:
https://docs.google.com/document/d/1...RIbKNNJk4/edit (it is pretty in-depth and has some maths).