This post is an exercise in describing the motivation and features of the Semantic Web seemingly without realising the tech stack already exists.
I spend almost all of my time thinking about this class of problems and hanging out with other people who do, and sadly it's vanishingly rare to run into anyone outside of academia who's trying to use the classic semantic web stack (RDF an suchlike) to build this kind of thing.
the commercial community of practice is small for sure.