The thing about quests is that you can look at them from a gamer's standpoint, wanting to experience all of that, and from From's standpoint.
I am personally convinced, Idea of players not being able to know or find something , or missing a crucial element gives Miyazaki erection. Remember world tendency system in Demon's? Do you honestly believe a person that came up with that gives a single fuck that some player somewhere missed a piece of content? He probably gets off on that, if anything...
I should be angry at that approach, but I kinda find it amusing... at least when i'm not trying to complete those quests myself.
I really doubt that he wants people to actually miss out stuff but rather encourage people to talk to each other. If he actually wanted to people miss out on stuff these games would be way more obtuse than they are now.