In a nutshell, no to all three questions.
The Aquabus can only transmit sensor values and control fans/pumps, all other functions of the devices connected via Aquabus are still controlled by the Aquasuite via USB.
In addition, you need the USB connection for firmware updates.
The Aquabus is only really useful if you use e.g. Linux because then the Aquasuite does not work and the devices can no longer communicate via USB.
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