yeah you are the big developer guy... its ok.. 
but you cant tell me how many hours it would need to convert all your storys into a video game ...how many hours ..it need to programm all that stuff and then there will be the question if its possible to use all for a game or not.
but anyways if you realy love to write own storys then you know that many things you write didn't belongs to a main goal from the heros .
like tolkien write much about the nature and clothing into the books and about aimless wandering .. and exploring..so that you can spend hours long to read it...thats a long journey...
but it doesn't belongs to the main goal . this is just to create atmosphere.to make the world feel alive.
some filler quest of dai do the same.
but yeah you are a right .. a good book or game should always ignore everything else and only care about one main goal. 
Nope. A very small developer. But I do write quests and lore.
No clue how many hours it takes to program it, add graphics to it, animate it, or voice act it, no. And oddly enough, it has nothing to do with the subject either. The subject is about adding quests with stories to them. Which Bioware has done plenty in every other title.
That bit you are describing is found in the codex. The one you didn't bother to read since you believed The Warden in DA:O saved the world.
And no. Tolkien doesn't write about aimless wandering. It is painfully clear, that they hare heading straight for certain destinations. The characters even spend several chapters planning out where to go. And all the info you get there is actually pretty important to the story, and why the people do what they do in the books. Didn't read it, did you?
Yes. A good book should stick to the story, and the main goal, yes. It is actually very very vital. Which is why Tolkien did that. Sorry you missed it, though.
A roleplaying game doesn't have to stick to the main story too tightly. A roleplaying game puts you, the player, in the driver's seat of your own story. The game may have an ultimate goal of that particular chapter, like the main quest involving the dragons in Skyrim. But around it you get tons of other huge storylines and quests you can play through, to develop your character and actually roleplay.
Picking flowers isn't the same as doing the Dark Brotherhood questline.