I'm wondering where you are finding chicken experts? I've never met one of those yet.
My granny fed corn meal to her chicks. I feed chick starter with layer ration but occasionally I've just fed layer ration. Both granny's and my chickens have thrived and went on to live long and productive lives, so I say mix and match, find your own way and realize that there are no "experts" out there....especially not on BYC. I'd sooner say our grandma's were experts before I'd say anyone here is.
Bee, everybody knows BYC is chockful of chicken experts!
But seriously if I could free range my hens, I would follow the ways my grandmother fed her hens. I know it would be much cheaper and healthier....