One of the original things for me is the combination of "low barrier to entry" (time between having the idea/story and getting it out there) vs. "value of entry"
These days, text based content is very low on "value" (thus why we scroll past many text heavy things on current social media) but video is very high on "barrier to entry" as most people have to record quite a few times, make sure they look good, etc.
My goal was to use audio to make it quick to get ideas/stories up there, but that people would see them as higher value (for example, I can hear the southern twang from some of my old college friends)
So I'd personally fight the word "novelty" but I might be a bit biased ;)
Skimmable. That could be really important given attention spans. Funny thing is reading your comment made me think back to radio. It was possibly second thing to be skimmable. You just keep changing channels listening a few seconds until you hit something interesting. Many people do the same thing with current stations in their car for discovery of interesting & popular content. It would seem an audio, social network could similarly be skimmable if people could tune across channels like that with ease. Would have to be fast with no wait time just like a knob.
I don't know if this does it or the author has looked into the concept. Just jumped out at me when I read your comment as I almost never listen to radio but was skimming it past, two days just to see what caught my attention.