I am wondering, I made a MIDI circuit and was advised to use ferrite beads in my device for MIDI input/output. It is a similar to the following circuit (only the L1/L2 ferrite beads are important for my question):
However, in most USB cables, there is a ferrite bead inside the cable.
If it is advised to use ferrite beads with MIDI, why aren't ferrite beads standard inside the cable? Or otherwise, why do USB cables use ferrite beads, and they are not within the USB device/adapter?
Below is an example of a USB cable having a ferrite bead (I assume) on both sides; btw, most generic USB cables do not have them, this cable is for charging a mobile telephone.