I don't think abuse is for the purpose of learning something. I believe that people get abused because they had the misfortune of an abuser having access to them.

After abuse, however, there is a lot to learn in order to heal and recover. Abuse teaches you all sorts of unhelpful behaviors and when a person is in abusive situations this means that they didn't learn good skills (because abusive people are too sick to teach good skills plus they don't have these good skills themselves).