If the modem communicates through USB cable, whats the advantage of putting it on a HAT?

Cellular Modules Quectel EC25 LTE Module
1

I was just wondering, after everything is said and done, what is the upside of the GPIO connection if everything is running through USB cable?

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2

I too want to know this. So far the documentation for this product is woeful.

3

I had assumed the USB connection was to give it more power…