What Difference Would it Make if You Had Not Existed?
I do agree that picking out the coherent from the incoherent is an important marker. If anything, I regard my own thread as a rather strange one. I don't think that the content of the outpost is actually incoherent but it could be seen more as an issue for personal contemplation as opposed to actual philosophy analysis.
As for the 'made up' aspect, that is where fiction is so different from non fiction/philosophy. So, it is ironic that Pratchett includes a dialogue about fantasised possibilities. Fiction often draws people because it is about imaginary worlds.
I was actually surprised that this thread has got as much interaction as it has. It may be because it was provocative to some extent. There is also the question as to what is sense and nonsense in philosophy. I am not sure that in human thinking in the two first century that sense always has the upper hand. I am not just talking about in philosophy but in thought in general, especially with so much that is written online.
Once it may have been that academia was too obscure and missed common sense, but it may have gone in the opposite direction of incoherent nonsense being enjoyed.
PHaving grown up in Bedford, situated in between Cambridge and Oxford, I used to see libraries and bookshops filled with some of the authors who you have written about. When I first began thinking about philosophy questions, these did not make much sense to me (and they do so more now, as a result of some of your threads) However, some of the writings of the authors can seem so obscure, almost to the point of incoherence. I knew people who enrolled for philosophy courses, including someone, who started studying at Cambridge, and just couldn't get on with it at all.
So, as far as I see it, there is a a whole spectrum between academic obscurity and incoherent non sense. It may be a fine line, with what appeals to different people and what can be regarded as meaningful, worthwhile philosophy discussion.