I think a good possible solution is to raise an error if `default_factory` is provided on a `init=False` dataclass that doesn't have a `__init__()` defined. However, it will create a slight inconsistency because there will be an error when `__init__` is not defined, but no error otherwise -- to allow calling the factory in custom defined `__init__()`.

The error would be "Error: default_factory argument needs `init=True` to be set on dataclass because default_factory value is created in the generated __init__() method".