This is really the essence of it. Section 230 is critical to a healthy internet, but there is large grey area between editorial and platform. Places like youtube, meta, X, etc. are pretending to be platforms when really they are algorithmic editors, gatekeepers, and curators. They are much more like traditional media newspapers than say your ISP, and they need to be treated as such.

What about the internet today is healthy such that anyone could point to Section 230 as the reason why?

The internet is unhealthy today specifically because the law elevates platform editorializing to the same level as individual freedom of speech.

I agree, but I'm not sure the person I'm responding to would. I cannot imagine how anyone could describe today's internet as healthy.