I don't even skim off the stuff when I'm cooking soups and stuff. My ancestors ate it because it had food value. I don't waste that foamy stuff. I just stir it back in, when I'm cooking for me.
Fine dining is totally different, of course.
/johnny
I think we should agree, though, that the flavour profiles of chicken and/or beef differ markedly from that of fish, yes? Barring stews, I've never observed that the bones of any small fish, eaten directly, are very flavourful.