Traveling abroad can be a great way to learn about oneself as well as about another culture. Encountering and overcoming challenges with different languages, customs, travel arrangements gone awry, etc. can help one develop inner strength, resourcefulness, and problem-solving skills that are not needed and therefore not tested in the home culture.
Traveling abroad enhances appreciation of the enormous variety within the human experience - which I contend enriches life!
Traveling abroad shakes up life attitudes and patterns and forces the traveler to reevaluate priorities and outlooks on life, which is a good thing for everyone to experience occasionally!