We were a part of 3 people and each of us had a task which made the development of this game much easier that if we were solo!
I think teams can help you grow and also you divide the stress of the deadline :)
Yes, there were times when I was glad that I worked solo but whenever I had to switch to Blender or other graphical software I was loosing so much time (and patience) and I really wished to have a teammate.