While this is probably true for most chickens it is not for my broody raised pullets, they choose forage over scratch mix all the time and they are constantly wasting a majority of the scratch mix.Chickens will always choose the tastier scratch
I really don't have a side with all this diet discussion (I do not believe processed pellets are bad and I don't believe a whole grain/forage diet is the only way), but I think it's good to discuss all the options and sides.