I think what a lot of you guys are missing is that while some games give obscurity as an option, the majority of quests are not designed for it. In Breath of the Wild many quests are like puzzles. You look at the vague quest details, and then you have to think about the world surrounding you. It is possible that one little thing you were confused about as you passed it before was a lead. You go investigate that lead, and it turns out it is for something else. Then you think again, what can this quest be talking about? And rinse and repeat. You have these types of quests at different scales too. Some are solved in the immediate area, while others are large scale quests throughout the world.
Vaguish Spoiler Example below:
For an example, there is a character in the game who is a bard. You can talk to him near his home town, and he tells you that he isn't going to go back home to his family until he learns all of the secret songs of Hyrule. There is no quest notice that tells you that this will lead to something cool, but you know it will. So then you eventually connect this idea that he needs to learn songs from all over Hyrule with a long non-linear chain of quests that this bard gives to you elsewhere. You find the same bard in another location in the world, and he gives you hints of all of the locations where you can find him and where he'll learn the song. He doesn't outright name these locations, but he describes them. There are multiple rewards you recieve for each of the quests he provides. When you finish all of the quests, you can finally find him in his home town, and if you speak with him at night time, he tells you an awesome story that is related the main story of the game and Princess Zelda. After all of that work you are rewarded for using the small mysterious connections to find the bard in different locations, complete his quests (which are riddles in themselves), you are rewarded with items when you complete these quests, and finally - at the end of all of it he tells you something relevant to the main story of the game, which you can't find anywhere else. Some other games do stuff like this, but most don't. The moment you talked that that bard, in most games, they would just put location markers on the map where you can find him. Almost every side-quest in Breath of the Wild is like this one, unlike other games which do it every once in a while.
