I believe it's because individuals like to work alone. Perhaps they think they can do the task better than others and don't trust their colleagues with it. As a result, they often have more work and probably more stress than their teammates.
我認為這是因為個人喜歡獨自工作。也許他們認為自己能比其他人做得更好,並不信任同事。因此,他們通常會比隊友有更多的工作,也許更多的壓力。