Yea it would have been nice to have the option out of the box, but wireless is the way of the future. Nintendo has pretty much kept everything wireless since the later days of the gamecube era.
They've never really embraced wired online. There's something about WiFi they really like, to the extent of almost pushing it forward. Either it is the convenience of the connection or the very politically profitable process of clinging to the cancer agenda, maybe both.