The fuse proxy should take care of allowing us to write over in-use files (it creates .fuse-hidden copies that *should* get dropped on file close).
I've never had any issues updating USBNet while checking MRPI's log over USB, in a shell whose binary was being updated, for instance.
(In fact, being able to do that without dropping the USBNet connection, like on legacy FW, was a big incentive when working on MRPI).
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