IMO that confuses simple machine readability, which is an immediate must-have, with semantic interoperability, which is an eventual should-have. And FYI, KERI and ACDCs do enable cross-domain semantic interoperability, well beyond anything RDF is/was capable of. See this piece for more info: https://github.com/SmithSamuelM/Papers/blob/master/whitepapers/VC_Enhancement_Strategy.md