Hehe, no, don't peceive me as impatient
When a good idea appears it triggers the mind and creates more ideas.
Now to your question. Yes, probably it could be a solution to assign 'comments' and 'like' to certain categories or sections only. That could though call for a change of categories/sections in certain cases. I fear that assigning articles to a certain section/category from a software point of view could be too restraining. My intuition tells me that this should rather follow the logic of the content itself (well, in most cases anyway).
How about this: Until now, we have always shown plugins using {plugin}. Would it be against the Joomla philosophy and/or impossible with the architecture of JFBCContent to have something like {DoNOTshow} in the necessary articles?
This would give the necessary flexibility and at the moment I don't see any downsides to that solution
All the best
Manfred