I agree a new player might not have as much trouble accepting an Action-Treasure or a card that returns to your action phase, because he never got used to some categories which i still think were useful in understanding the game. It's not something new to explain, but instead means that you can't explain things as easily as you used to. You have to be more accurate. Obviously, those things happen all the time. Before Horn of Plenty and Bank, people could just put all their money on the table in any order, and nobody cared. Before Philosopher's Stone, people could just flash their money and as long as nobody else cared, that would be okay, too. Those simplifications which work at the beginning and then have to be replaced with more accurate explanations happen all the time, and it's obviously necessary for a game that adds more and more content.