I tend to agree that even among the most "tech head" type gear driven users the scenario described is too much of an edge case -- it is not realistic to expect a "chain" of equipment to pass all the info needed. These kinds of scenarios are part of the reason that there are enhancements to ARC (that are still not really fully production ready even in the "latest and greatest" gear from big firms like Marantz/ Denon...).

The various "specialty electronics firms" that supply everybody from churches to major AV fitters for conferences and such are increasingly forced to come up with clever ways to work around the limitations of various implementations of anti-piracy in the specs; anybody trying to incorporate such "features" in actual consumer grade gear would probably fail the required certifications...