This is a cool pitch! I want this thing to exist
One specific thing I like about is is you list lots of interesting problems in the motivation section, each of which got me intrigued but made me think they were different domains. But together they primed me to be in the right semantic space to receive your proposed idea which was concrete enough for me to visualise.
As a maybe relevant adjacent thing, are you familiar with the "bullet comments" format popular on Chinese social video sites? this achieves some but not all of the goals that you're aiming for, but it's interesting to see western audiences react to it - lots of people have a visceral "how could anyone watch anything like this" feeling about the UI, even though people familiar with it like it. I think you're going to have this challenge to overcome with any tool that meaningfully changes the phenomenology of engaging with a live experience - bridging from the audience's expectations.