This will allow to, for example, use one board for mass storage, and the other to connect various USB devices: mouse, MIDI controller, printer, whatever you need (as long as you find someone to write a driver).
Strictly speaking, it might be possible to handle both a mouse and a USB stick on one card by using a USB hub. But this has to be coded and tested, the CH376 documentation is unclear on this topic. [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/albireo-usbsd-interface-for-cpc-new-version-without-serial/msg248489/#msg248489 Source]
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