Me, too. It's the only way to get a good read on the non top 8 like barley. In fact, that might be a good thread topic alone. What brands and products do we trust for barley and rye labeling since there's no FALCPA protection. Moreover, I find it so dang hard to get real info on grain contamination from companies that no, it's not just a gluten thing, it's going to be all the proteins. For nuts it's typically easier to get info. I find with grains LTFA there's a technique to get past the Domino's definition of gluten free where it's more of a marketing term for no direct gluten ingredient but it's contaminated as all get out.
BTW, I posted an OIT on wheat. It's the only one I've seen so if you've seen others let me know.