By fianchettoing the bishop to b7, black can seriously control the Stonewall itself by limiting white's options. For example, the bishop on b7 can target e4, which can support an annoying knight jump, the bishop can target the f3 square, which is absolutely needed for a rook lift.  To make things even worse, white also can't have a thorough attack on the kingside, while black can keep attacking. Help, please?