Actually there is if you ever want a truly intimate relationship with someone. My H's immaturity was part of the death of our marriage. Our T said my H at 54 had the maturity level of a 12 year old. I had no interest in being his mother.....I wanted a partner & there is no way one can be a partner with someone who was incapable of maturing.

Just depends on what one wants in life & what kind of relationships one wants to have whether immaturity becomes a problem or not.