I absolutely recommend composting kitchen scraps over feeding them to chickens for the dietary reasons listed above.
I'm just in the other camp and hope to feed as much kitchen scraps to my birds as possible. As long as they are happy and healthy, I'm fine with it. In reality, my young pullets don't eat most of the scraps I offer them, so it gets raked up and thrown into the compost bin anyway. I hope they will eat more variety of scraps as they get older. In any case, I think they would eat what they need, or want, from the scraps and they always have commercial feed available to them in the coop.