When I talked to Steve Turay about this topic he told me they were made in glass bows to be able to shorten up the bow length and still maintain good shooting characteristics. Now, this was before (I guess) bowers had figured out the magic in still making a narrow limb, deep core bow short and still a joy to shoot.
I do know Steve told me the Barage replaced his Huron ( flatbow) because he feels the narrow limb , deep cored bows are quieter and more stabil. With that said, he will still make a Huron if you ask,