I wouldn't say that. There's many ingredient's that weren't used for over 1000 years because they just weren't in the area. Barley and wheat were used in europe predominantly because they were there and plentiful. They also possessed the right nutrients and eventually the right alpha and beta amylase amounts necessary to convert to fermentable sugars.
We're in this subsection of the forum, because we (or someone we know) needs gluten free. Some people aren't gluten free and they have the luxury of further experimenting with things some of us cannot. I'm curious too in how the gluten free grains will taste when properly converted with alpha and beta, and that's the purpose, to learn things.
Should people people mash gluten free grains, yes with barley as the amylase contributor, then there's a good chance a person who knows the outcome of barley will be able to detect what flavor contributions come from properly converted gluten free grains. It's a darn sight easier than malting grains like we're doing now.
If we only brew with "the known good ingredients" (barley and wheat) then we gluten sufferers wouldn't be able to drink it now, would we? Thats why we ask people like you yodalegomaster who can experiment freely with both, to see if they have.
We learn from history, yes, but we have to try new things. We could still be using only regular mail, after all, why bother with email or forums? Paper mail has existed for hundreds of years. You won't learn anything by trying out this new fangled email, or facebook or twitter.
Why bother drinking beer? We could be drinking gluten free vodka or wine. Why bother creating new beer recipes, aren't the old ones good enough?
No, the purpose of the question is because we want beer for any number of reasons, and we want good beer. Thus we have to research and experiment and test and break down the flavors as best we can to create something that's better than what we have now. We don't want to feel like second class citizens where people don't want to taste our beer because it doesn't taste good. We want to make beer that any person, gluten free or non, will want it because it tastes good. We want people to go to a place and say.."out of all the beers here, the gluten free one is my favorite".
I'm glad that Jolly Pumpkin's gluten free beer gets that from people I talk to. It means that it can hold its own against normal "traditional" beer.