Your code: If you're using NumPy APIs directly in your application code, your code might break. Direct dependencies: The libraries you directly use in your code might be incompatible with NumPy 2. Indirect/transitive dependencies: The dependencies of the libraries you use in your code might be incompatible.
When NumPy 2 comes out, all existing releases will claim to work with NumPy 2 but will actually be at least partially broken. With any luck the maintainers will have a new compatible release out by the time NumPy 2 comes out, but again, these are volunteers; they might not hit the deadline. And this is just one out of many libraries.
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