Another big reason is security - the less a nefarious actor knows about a system, the better (at least from the perspective of a large, closed organization). N

Another big reason is security - the less a nefarious actor knows about a system, the better (at least from the perspective of a large, closed organization). Now we know this is not always true, but even giving out details about schema, data-organization or technologies used could provide more detail than is necessary. We could argue the merits of this approach - I can certainly sympathize with the idea - but security by obscurity is still a rampant ethos in huge corporations. I wouldn't be surprised if TSA also enforced a bit of this as well.