An AI development team has fine-tuned a large language model to be an expert assistant for the Python programming language. However, they observe that the model frequently provides code snippets in other languages like JavaScript or C++ when prompted with ambiguous queries. A senior engineer suggests a further adaptation step using a new dataset that includes not only more Python examples but also examples of JavaScript queries explicitly marked as 'out of scope'. Explain the reasoning behind why introducing this more varied data set could help the model become more specialized in Python.