This remains to be my go-to example for how YouTube can be a remarkably effective and valuable platform for the kind of enthusiast whose interests have exceeded the bounds of typical documentaries and media produced for the general public.
It’s sadly getting more difficult to surface these kinds of examples, as we’re seeing a lot of lowest common denominators and slop-py channels run by people who only want to be YouTube content mills, rather than people who have expertise to share and who learned to leverage YouTube as a means to those ends.