The bigger problem I've seen with pretty feeds is birds picking out only their favorite parts and getting malnourished... or if predisposed genetically somehow (Orpington for example), and ALSO fed excess treats like scratch... have even resulted in fatty liver hemorrhagic syndrome (and possibly sudden death). Most folks don;t have necropsies done and will blame it on heart attack.
I did fermented feed ONLY for 2+ years for flock of 82+... I saw NO benefit from fermenting... no increase to health, no decrease to feed cost. It may be helpful to birds who need it more... but dry feeding has not increased my bill OR health issues... Turns out our formulated rations area already formulated to meet the needs of our birds!
I don't feed a whole grain feed... but I have sprouted and even foddered whole grains... without ANY crop issues.
Sometimes crop impaction can be a symptom of something more serious like Marek's. Other times it may occur do to something to long getting tied up too big to pass into the gizzard (or hardware crop)... like a long piece of hay. But gizzards are made for grinding and whole grains should NOT present a problem and pass through the crop sphincter easily.
What nature intended is a cool ideal! It never intended for us to selectively breed fowl to lay hundreds of eggs per year and keep them in our yards.

Everything made commercially is made to appeal to the consumer... US!