Any PhD work done at the industry was published. There were scientific magazines. Books were published written by scientiest of major manufacturers. Agfa even had an own publication on scientific matters. Only matters of direct benefit to competitors were not disclosed.I agree with your previous arguments, but I should say that these kind of research info, as well as tons of other research done by Kodak, Fuji, etc... is not leaking to the public domain. We know very little of what was reserarched inside those plants. Much of we know was because of the generosity of Ron Mowrey (RIP), but many have acknowledged film production was based on mostly closed (secret) research.
But I agree, there have been absurd incidents. I myself experienced that at a major plant a bunch of documents had been ordered to be destroyed. On top of them a old Phd work that by no means could be saved by me...
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