1. He has too many shortcomings, which may be related to his life experience, including overconfidence, being good at hiding, selfishness, ambition, pursuing fame and fortune and so on. These characteristics make him unfit to be the person in charge of opening a shop.
He may not have enough money or other resources to open a shop. At that time, opening a shop needed a lot of resources such as capital, manpower and material resources, and he might not have enough funds to support a successful shop.
His personal character and behavior may not meet the moral standards of the society at that time. At that time, people paid more attention to moral standards and moral behavior, but Lu Mengshi's personality and behavior may not meet these standards, which may lead to his failure to gain social recognition and support.
Fu Jude's roast duck restaurant is well-known in Beijing. He may think it is difficult to open a new store and achieve better development on this basis.
All the above are the reasons that may lead to Lv Mengshi not opening his own shop. Of course, these are just my speculations, and there may be other factors for the specific reasons.