Ya Sultan Madina - No I don’t have to learn from you about the greatness of Lady Khadijah (ra). I, and others whom you may lump together alhamdulilah know her virtues and sacrifices for Islam and undaunted support of the noble Prophet (pbuh).
She is never under attack but the other wives of the noble Prophet (pbuh) are. So naturally they need defending. That’s the reason they get mentioned.