There are a lot of sites with Digital Terminals 20xx extensions installed.
Those cannot upgrade to the 3.0GA but they must have a stable software from Avaya. Avaya can't get away with the messge "upgrade to latest build" if there is no latest build other then the one used.
There will be a 3.0 maintenance release soon were the knowledge of the 2.1.35 build will be used in 3.0.
A major reason to use the newest software is commonly because sales people intend to sell the latest features to customers, so engineering don't have a choice.
We, the "bleeding edge" have at least the guts to sell and install the latest features and to be honest, most of the bugs are never detected at one particular customer and most customers using 3.0 are quite happy with it.
My advise to you cobragb is not to wait with the latest software until all bugs are gone, if you do so then you are still selling 3.0 while we sell 3.1, who will be the on who sells most?