Nothing beats it for data exchange? You must be joking, because if it were remotely true RDF would be in wide use, which is totally not. Except a few niche domains like bioinformatics, it is not used. No killer application use it as a data format, no popular data format is based on it either. Actually I can think of a single data format based on RDF, and the only open-data I know which use it have been converted to it and was simplier to use in their original format.

And for the model: property graph. But yeah, enjoy your Stockholm syndrome with your model where reification is required to annotate an edge. Also even your nickname is an aknowledgment of RDF failure: named graphs (n-quads) were created because RDF triples aren't good enough for modeling data.

Yes, let us see how you do data interchange without global identifiers. Such as URIs, which RDF has built-in natively and property graphs do not.

You're right about bioinformatics, but lets do a quick check on http://sparql.club/ on who else is looking for RDF/SPARQL specialists. Oh look: automotive industry, finance, publishing, medical, research etc.