That would suit the some who want to keep information as "secret squirrel" stuff which seems to be the norm nowadays.
Most people who withhold information do it not based on some kind of childish desire to do so, but because it is the right thing to do. The ones that log into the forums specifically to tell people "I know something, but I'm not allowed to tell you" ARE doing it out of some childish desire to withhold information - it's the old "I know something you don't know, nyah" from the school yard.
This may come as a surprise to people who think they have the right to know everything about everything, but some information is not for the public domain, for good reason.
I agree with you that any move to limit discussion is a foolish one - there is nothing wrong with discussing facts, scarce though they may be. The problem is when people develop tin-foil-hat notions that the preservation societies are intentionally withholding information and are secretly planning to scrap steam locomotives to fund the purchase of a Gold Coast holiday house.
As an example, say that you were a member of organisation A. There was an issue between that organisation, and organisation B. Perhaps someone said something stupid, and it escalated. Perhaps a mistake was made, and that caused an issue between managers of the two organisations. Is such a dispute best resolved by people privately - people who know the facts, and can make an informed decision? Or is that issue best played out in a public forum, where people with obvious bias and vested interests, people who know half or none of the facts, feel free to tell everyone exactly how it should be?
Why can't we just discuss facts, discuss the steam locomotives that we have - why does everything in this hobby have to be related to childish squabbling about he said she said?