Learning ASL is not going to help a person become more functional in day to day life. If they imbed themselves in the dead community, maybe. It’s like saying, “I stutter in English but not in German, so I will learn German to talk to all my English speaking family and friends.” Same concept. It is not a functional communication solution. If you want to stop stuttering find a speech therapist. Yes I also promote stuttering in general. Once one becomes accepting and stops avoiding stuttering the severity decreases.