^ i think E=MC^2 is just what people want from her. a lot of people liked her last album and this new one is essentially just more of the same. even the name implies that, "emancipation of the mimi to the power of 2"
Mariah isn't really an innovator, but she has found her genre and people enjoy it so I guess she does not feel the need to experiment but rather does what she likes and what people want from her.