How to get audio via USB cable?

I got a response from Yamaha support and the issue is that Cubase can only work with one ASIO device, but that doesn’t explain why Cubase can’t take the audio received from the MOXF8 and output on the host computer using Windows direct sound (directx). What’s the point of the MOXF8 being able to send audio data back to the host, if the host software can’t output that sound?