Right, it takes time. When I go out of town, and leave hubby to care for the flock, I tell him just feed dry. I'm not asking him to clean the bowls or make up new batches.
I don't know the research, but I think fermented foods are beneficial for humans, so logically extend the idea to the flock. I make kombucha. and sourdough, have made pickles, kraut, yogurt, fermenting is like a hobby.
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And,
@Cooba ... if you find, like me, that chickens prefer it, then they are going to balk at their dry feed if you decide to go back to only feeding dry. I went back to only dry for a long time, and then, stopped free ranging abruptly after a hawk attack in December, and felt like offering fermented as a sort of consolation. On these freezing days, it seems like a hassle, as it freezes. That's another con.