[quote=@Scrapula]
It seems like a better idea to give exposition in parts as the party is going to and through the dungeon, instead of all at once several miles away from it. I mean, that's how most stories with a prominent dungeon in it go. I'm not sure why they do it, but I think it might be for pacing reasons.
[/quote]

That would also make it take longer to get to the dungeon [i]and[/i] get the important exposition, because it involves breaking up the journey. Presumably the opposite intention of everyone running off.

You're meant to listen to quest-givers to know what, exactly, the quest is. Even if they're coming with you. Adventuring 101: find out what the hell you're doing if you can. 

As for why the post wasn't up yesterday: I was unexpectedly not at home for most of the night, and hadn't been able to get the necessary information earlier due to time-zones.