Why the `nwb_`?

why are the core parts of `file`, `utils`, etc named as `nwb_XXX`? It seems unnecessary given that the main package is already called `nwb`, and in the examples when they're imported, they are already renamed w/ `import nwb.nwb_utils as utils`. Maybe this is a minor point but it'd be good to streamline the API to follow conventions of other major python projects in the numpy ecosystem