are you implying I'm cherry-picking 'the science'?
First, I have not, I think, actually done that. Second, commercial feed provides adequate nutrition only under the terms of its aims, which is why the methodology of the studies should not be ignored. They aim to maximise output at minimal cost, and the 'science' is performed usually on birds that are not normal - they're either days old chicks, or birds that have had their caeca removed surgically before the 'trials' in order to simplify the results and their interpretation, and/or the feed trials are performed on Nth generation severely selected lab strains of birds that once upon a time were chickens of the sort that you and I look after.
This is an important caveat. It would be interesting to know many people reading this thread keep modern high production breeds. I know it started as a thread about ex- commercial birds aka rescues, but most people who post photos seem to have some or all heritage breeds or backyard mutts, both of which were capable of laying c. 150-200 eggs a year a hundred and fifty years ago, long before commercial feed appeared on the shelves of shops.
https://www.backyardchickens.com/threads/how-many-eggs-were-laid-by-hens-150-years-ago.1593024/
At least, I haven't noticed anyone here posting about their hens laying 300+ eggs per annum, which is what modern layers feed is presumably designed for, if I've understood your point aright.