Audio hasn't worked for me or my friends across Linux or Windows. Been kind of a pain.
It also seems to suffer the XWayland issue in Linux that Discord did for quite some time where it just flat out fails to get screen capture in the desktop app, but works in the browser. Electron pains
If I remember right, that post wasn't designed to highlight a practical use-case, but rather to set up a simple task as a "how could I apply this?" type of experimentation. The guy got roasted for it, but I think it's a very reasonable thing to try because it's a simple task you can see the direct result of in practice.
The cost problem was highlighted as well, because if such a simple task is a problem, it can't possibly scale well.