I think it is excellent advice for someone who work by themselves and try to find some joy in coding after being in a rut. Yes, some conventions do emerge when being in a large team, it is inevitable, but this is not what this guy needs. Git + Trello is enough for personal projects or small teams. Anything else is a bonus or something you will add down the road and that includes testing or whatever other best practices. There are many jobs, especially in a non tech environments where you can be a sole dev or a part of a very small team, real small and mid businesses that generate value and are much more fun to work for for certain types of personality.