I haven't found that tobacco needs to breathe or anything like that, but I have found that most of the blends I like need to be at a pretty specific moisture level to deliver the best they have to offer. I am not on board with this "dry your Virginia blends until they are crispy" train that I see here often. I think that most tobaccos smoke best a bit short (on the wet side) of crispy.
I will say that some blends aren't as fussy as others in my experience, and I don't just mean easy burning OTC burleys and the like. For example, I've found that if I get GLP Quiet Nights at just the right moisture level I can get a really incense-like note out of it which just brings it to a whole new level, whereas pretty much every bowl of GLP Westminster is equally good (so long as I'm in the right ballpark for moisture levels and bowl packing).