It controls whatevwhatever hardware, reads some sensors, etc.
Then when needed gets oders from a normal computer over network or BLE via some simple protocol.
In reality, though, the use cases where you need Linux and GPIO are very slim. It's overkill, an ESP32 is realistically more than powerful enough, and Linux isn't even good for GPIO.
IDK why anyone would build a full product around one, versus the more sensible option of maybe prototyping with one while planning a shift, whether it's the 'Version 2' or something. Anything other than dependence in a full platform when half the point of ARM was how easy it is to get your own semi-custom spin.
https://www.compulab.com/products/system-on-modules/?gad_sou...
I haven't cross refence but this looks like the Linux SBC that is inside the Eightsleep
https://www.compulab.com/products/computer-on-modules/cl-som...