Finding the White Witch is kind of the "main quest" (A Source Hunter's Journey) in act 2...
...as your main purpose is still finding Jake's murderer and the White Witch is to be rumored to be that murderer.
Following this quest leads you exactly to the "right" spots with enemies balanced to your level.
A game without enemies scaling to your level is never really open world. And it's really not all that hard to think about what to do next...
Did you know in Cyseal the main source hunter's quest isn't something you pursue immediately? You end up doing a bunch of other stuff along the way like "Shouldn't I be doing this...?" By Act 2 you get vague hints about the white witch and how to get to her, but the way it's worded and the way Cyseal was makes you think "Oh I guess I'm supposed to do other stuff to get to her..."
Not to mention the fact that you find an NPC and ask her where she is and he just says "Over there!" Where's there, exactly? I managed to find just about everything before the witch's cabin because "there" is not exactly helpful.
