1. Carelessness, lack of professionalism, and instability from many of the core language and package developers 2. Over concentration of the main contributors

1. Carelessness, lack of professionalism, and instability from many of the core language and package developers 2. Over concentration of the main contributors within the same startup that has a questionable business model and long-term prospects 3. Language issues that limit the desirability of Julia for use in larger projects