Nothing inherently wrong with soybean meal.  BILLIONS of animals have been fed soybean meal successfully over the past years.
		
		
	 
and humans too!  Plenty of cultures with high soy consumption and limited animal proteins (though the numbers are likely a few hundreds of millions over the centuries, rather than billions) - why there was even a time in my life when the benefits of a high soy diet were touted as one of the ways to increased longevity...
At least here on BYC, soy tends to get a bad rap from the same people whose demonstrated knowledge regarding the feeding of chickens makes me question the basis for their expertise regarding soy, generally.  As with all generalizations, there are individual exceptions of course.
and early 2020, if your news feed wasn't dominated by either politics or COVID, or COVID politics, fermented soy was trending positive as a healthy diet component.  (I watch a lot of cooking shows, or did, till I moved to an area with no cable, and barely any internet).  My sense is that "fermented" remained a buzz word, but perhaps soy did not?
and, in the interest of full disclosure, I don't personally eat a lot of soy.  Not for health reasons, but because growing up, I ate a lot of rehydrated, previously dehydrated, pastuerized, processed, chopped, reformed, artifically flavored soy protein in various lightweight meals designed for backpacking.  It doesn't have the best memories associated with it, honestly.
as the 
CA Teacher's Study continues to be sliced and diced, I suspect we will 
learn a bit more that challenges widely held cultural beliefs re: a host of dietary choices.