Three magical women are captivating, because they transcend the simple positive/negative dichotomy. They aren't enemies in a "good witch" v. "bad witch" scenario, but are a force to be reckoned with as a collective.
The archetype of the witch is long overdue for celebration. Daughters, mothers, queens, virgins, wives, et al. derive meaning from their relation to another person. Witches, on the other hand, have power on their own terms. They have agency. They create. They praise.