@DJac
I think that it's could be called the indicator area - I have not found an 'official' name.
So in a word, you would like an USB icon at this place ? Maybe it's a good idea, however I'd guess that system developers could be not so keen in overloading this area. There is a Bluetooth icon, yet this connectivity is immediately available while using USB requires connecting a cable.
If there was an icon that I'd remove in favour of Usb, it would be 'Files'. First I don't know what it's for since it is empty on my phone, then phone are not very files-centric, maybe it was a classic Linux bias ('in Unix everything is a file', yet this should not necessarily imply that there should be an icon in priviledged position for this).
If someone can explain why 'Files' should be here rather than 'Usb' - you have given an explanation for the rationale in favour of Usb,- let's them do speaking.
If no one yells for Files, I'd say that you could raise the issue in a Q/A. As I said, your proposition could make more sense if you could advocate for leaving the indicator area not more crowded that it is already. In my opinion, all the remaining icons but Files seems at least as justified as Usb (or even more) for a rapid access.
