So I don't think we have answer yet as to why you wouldn't use USB.
How did that bad reputation arise? A combination of factors:
* USB 2.0
* Platforms like Raspberry Pi, where both disk and ethernet are on the same USB link.
* Sellers marketing products with the USB link bitrate (5 Gbit/s) rather than the rate of data transfer from the ideal disk.
* Embedded platforms that don't have the performance needed to saturate a gigabit ethernet link (or 5 gigabit USB 3 link)
* Articles like this, reporting "60-113mbps" without going into enough detail to determine which components are the limiting factors on performance.
How did that bad reputation arise? A combination of factors:
* USB 2.0
* Platforms like Raspberry Pi, where both disk and ethernet are on the same USB link.
* Sellers marketing products with the USB link bitrate (5 Gbit/s) rather than the rate of data transfer from the ideal disk.
* Embedded platforms that don't have the performance needed to saturate a gigabit ethernet link (or 5 gigabit USB 3 link)
* Articles like this, reporting "60-113mbps" without going into enough detail to determine which components are the limiting factors on performance.