At university there was an introductory talk about recycling, where they threatened that a single wrongly discarded piece of trash (uncleaned bottles or food containers IIRC) would prevent the whole batch from being recycled. The obvious conclusion being that if there's even a small amount of doubt about whether something can be recycled, it'd be better not to put it in the recycling bin (and risk the rest of the properly recyclable trash).
I reached out for clarification on various policies - what about bonded plastic + paper, how clean, mixed plastics in bottle assemblies, unlabeled products, etc and they weren't able to answer.
So I'm not at all surprised consumers aren't effectual.
That said, while I want to believe machines are doing a much better, do you have any sources on the recycling statistics? San Jose claims to be an outlier at 74% recycling (diversion rate?) https://www.epa.gov/transforming-waste-tool/zero-waste-case-... - nationwide municipal solid waste looks like only about 1/3 recycled https://www.epa.gov/facts-and-figures-about-materials-waste-... . If these machines haven't been rolled out, are they very new, or are there some barriers to using them?