Feminism doesn't have an endpoint. Even if perfect gender equality was achieved, proper feminism could still study the life and history of the female portion of the population. Not to mention many modern feminists aren't interested in equality but rather reforming the world to their liking. After all, much of our society and culture was designed back when women had mostly unofficial power, that is, by men, and those modern feminists hate it.

"Feminism is Gender Egalitarianism" <- Incorrect.

Much of feminism is gender egalitarianism, but not nearly all of it.