Again, you're saying fiber optics provides features that telephony doesn't. The fact that telephony usually runs over copper cables, and telephony over fiber op

Again, you're saying fiber optics provides features that telephony doesn't. The fact that telephony usually runs over copper cables, and telephony over fiber optics is a recent thing, doesn't change the fact that the comparison makes no sense. Telephony (websockets) runs over the copper cables or fiber optics (HTTP/1 or HTTP/2).