Reinheitsgebot is outdated, over quoted and devastatingly limiting. It's like telling a great chef that all she can use is beef, mushrooms, salt and pepper, yeah you could make a great steak or burger, but what about a crab boil.
The law was lifted in May of 1987 and thus German brewers are also allowed the creativity and freedom of other brewers around the world. It must have been very freeing to be allowed to tinker with ingredients and still call it beer. It amazes me how many people still site these laws in an attempt to make their beers sound that much more appealing.
The Reinheitsgebot was not written to make beer tastier, or to protect the integrity of beer or of the father land, but rather to make beer safer to the consumer. It was also written to limit competition for wheat which was in demand for bread and other food stuff in Bavaria and Germany at the time the law was written. So when you see that hefe that is in compliance with the Reinheitsgebot, guess what it isn't. This is just one of the examples of the word "Reinheitsgebot" being used as a marketing ploy.