If all a person has to evaluate me on is public Github contributions, it'll seem like I only work one day every 3 years or so. With all the other things I do with my life (sport, art, socialising), I very rarely have any time (or motivation) to program in my free-time. Having all of these "extra-curricular" activities is probably good for my mental health and makes me a better engineer than I would otherwise be if I spent all my time both at work and in my own time working on software.