While I very much life PFKS, she's a liar at heart. Academia focuses on lies, among the other idiosyncracies...
It makes sense when you think of LoN as a limbo, a waiting room for souls to go to the next step. That'd make succubi the cleaning crew - they'd be the cleaner fishies picking off the extra, unwanted bits.
The point and the main interest of SQDT's work, is that they leave much open room for imagination and interpretation. Godly work on that front, IMHO, for the current society and market direly lacks that stimulation.