Shielding doesn't mean it meets the required impedance/attenuation for the USB frequencies. USB uses the same idea as Ethernet (differential signaling) so you c

Shielding doesn't mean it meets the required impedance/attenuation for the USB frequencies. USB uses the same idea as Ethernet (differential signaling) so you can make an analogy - Ethernet requires different cable specifications depending on the speed, and it's the same with USB. And the same as with Ethernet, you can usually use a lower-specced cable for short lengths.