I have a theory.
I believe FA is the organism that takes advantage of plentiful nutrients in a BOW until the time that root based aquatic weeds take over that job. In the absence of said aquatic weeds, the FA provides a valuable function of providing YOY fry, aquatic insects and other "critters" valuable cover, thereby enhancing the long term success of the fishery.
FA can be a good thing. There, I said it. The way it makes a pond look sucks, but as far as the under water portion of pond health goes, it provides a valuable service.
I just came out of the FA "closet". I kind of like a certain amount of the stuff (but not too much
)