Pandas ENH: Make ExtensionDtype.numpy_dtype part of the interface?

pandas.ArrowDtype and nullable types define numpy_dtype to express the analogous NumPy type. Should ExtensionDtype.numpy_dtype be part of the interface as well, defaulting to np.dtype(object)?

Comment From: jbrockmendel

What would it be used for?

Comment From: jorisvandenbossche

Some related previous discussion: https://github.com/pandas-dev/pandas/issues/22791