Ah, as expected, when you say “concrete thinking” you mean thinking that isn’t incoherently muddled.
These ‘categories’ DO NOT act like ‘rooms’ George. You cannot use them to “segregate” ID, except to the extent that a large proportion of the topics are already segregated – hence why I previously said:
That won’t start making ‘categories’ miraculously start acting like ‘rooms’ George.
Many topics, including this one, are ‘Side Conversations’ which are not seen by the masses anyway (assuming we’re defining “the masses” as non-members). 
Are you demanding that all topics on ID be created as Side Conversations, and that all topics that divert into ID be recategorised as such?
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Then you probably should have said so, rather than babbling on endlessly about ‘rooms’, ‘side-porches’, etc, etc.
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It is unlikely that moderators will consider your demand to be workable.