I can't say I disagree with anything here, it is well reasoned. I do have a knee-jerk reaction when I see any outright refusal to provide known information. I see this kind of thing as a sort of war of attrition, whereby 10 years down the line the pool of knowledgeable engineers on the topics that are banned by those-that-be dwindles to nearly nothing, and the concentration of them moves to the organisations that can begin to gatekeep the knowledge.