Keeping his attention focused on the task, whatever it specifically happened to be, Zhuangzi lost sight of the larger picture. His scope was too small. And scope is one thing that Daoism definitely has as an advantage over Yangism. Yangism believes that all problems can be solved from the inside out. However, random events do occur.
Life is dangerous and unpredictable.
Yet, there will always be some chance. This is why Daoism preaches a conquering of the fear of death. Sometimes you are simply killed at random by circumstances, and there is nothing that can be done. However, if you live in fear of this fact, you will be paralyzed. One must be ready to accept all possible outcomes, perceiving that they are neither good nor bad.