Not speaking "for or against" the topic, but simply interjecting "question/information" that I admittedly know less about than those "in the know".
I am under the impression that when electric current travels through a metal, it produces "RFI" and "EMI" (Radio Frequency Interference and ElectroMagnetic Interference) These supposedly "radiate" with various behavior and propensity depending on frequency and strength of the electrical impulse, as well as some other elements and factors.
Both of these are called "interference" because I assume they, in some way interfere with the signal carried by wiring, or they can create their own distortions from that signal.
I am under the impression, that each and every wire that is carrying current, both produces and receives these forms of interference, both from themselves and other wire carrying signal close enough to broadcast to them.
I am also under the impression that the sheilding performs the "function" of sheilding the wire from both transmitting and receiving these forms of interferences as well as developing a specific type of electrical charge themselves that has a tendency to assist in this function, or in some way ameliorate its harm.
So while I can't say that the "active" cables or their active dielectrics "DO" this, I get the impression that sheilding is supposed to do this, active or not.
I think the other concept is that if a wiring is "producing or transmitting" EMI/RFI, that certain kinds of sheilding reduce reflection of these tranmissions, or nullify them as they are "reflected back" onto the wire that produced them.
Now I cannot tell you how I got these impressions, since I haven't read of them in this much detail, however it sounds interesting
Maybe someone "who knows" can offer clarity.
