New Redemption Grab Bag now includes an assortment of 500 cards from five (5) different expansion sets. Available at Cactus website.
Unity is new, and I think that it is important for the game to continue development and introduce new ideas. I think that sometimes ideas are introduced to expand the game (thinking introduction of territory class) and sometimes to balance the game, which is what I think Unity is supposed to accomplish. As far as new players understanding this, there will always be a learning curve to gaming, and especially gaming at different levels. New players should start with the starter decks and build their knowledge from there. I don’t think that has changed.