There are many players that don't want to be challenged or explore, they want to complete tasks and get rewards. Some of them don't really care that much about the actual gameplay, as long as there is a quick way to complete sets of tasks and get their rewards.
Some of my friends are like this, they blast through games without looking at anything but the tasks and rewards and they hate having to figure things out, explore, discover and other road blocks to their "task list". They move at break neck speed too, like their lives depend on it. It's really hard to keep up, becasue they never stop at look at anything, but just rush to the next marker to finish the next task.
I had to actually stop playing certain types of games with them, because it would completely ruin the game for me.
I like exploring and discovering and figuring things out. If everything has an easy hint, marker, or otherwise shortcut that takes that away or discourages it, i would enjoy games a lot less.
An external wiki/youtube etc. gives you that choice when you need it, but it's far enough away that you can still enjoy those parts without using it.