Cult of the Absolute can be analagous to the Cult of the Unseeing Eye, let that arc develop. The quest with the Paladins of Tyr who were corrupted by Zariel screams what you are describing. If you read all the books you pick up they are building up Shar vs Selune pretty significantly besides the Avernus story line, seems like more will happen there perhaps even with a good side redemption storyline for Shadowheart (i am looking at you the book in the first dungeon that described the priestess of Shar who was forgotten). There was some serious ontological stuff if you look, but it doesnt necessarily smack you in the face like BG 1 and 2 or PST. You have the Zhents and the Flaming Fists and other things that play out their place in the realms rather well. It did not feel as overwhelmingly Faerun as 1 and 2 but it felt like Faerun to me.