I understand it is a banned stage. However, it was already in Brawl. I see no reason for them to have removed it, other than if you can only have a limited number of stages present (which makes sense but it disappointing). If Big Blue can stay why not Yoshi's Island? I am new to Project M (finally managed to install it today) and it is near-perfect, but this is the only thing that bothered me. As a more casual player it is sad to see one of my favorite stages axed completely when it was already in the game. It would be nice to see all three Melee + Brawl Yoshi stages present in one game, if that is even possible.