I agree that for most of us here, there is no need for layer feed at all, it's meant for light high production like white leghorns in cages (as a MIN protein even for them) with our larger "dual purpose" birds 16% is not enough IMHO , plus there is the calcium thing(which some clearly don't agree with) for the roos and non laying hens, not laying yet pullets etc. etc.
With free choice oyster shell, grit on the side also free choice the chickens can self regulate their needs, they're likely better at that than any of us here are anyway