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.
我认为这是因为人们更喜欢单独工作。他们可能认为自己比别人做得更好,不信任同事完成任务。因此,他们通常比团队其他成员有更多的工作,可能压力也更大。