This little-used word has a certain appeal for its precision of meaning, its utility for those concerned with argument (and detecting flaws in argument); and for those who wish to be seen as being in the possession of... well... um... recondite knowledge (sciolists and the like).
Recondite: Adjective ...(of a subject or knowledge) little known, abstruse.
It could fairly be said that informal fallacies in thinking is now a recondite domain of knowledge.
However in times past, it was a commonplace; a domain of knowledge which was part of the core curriculum in the classics and humanities.
Our grand plan here at humbugonline is to make fallacies in thinking less and less recondite, until wankers and delusional lunatics have nowhere to hide.