The bolded is quite realistic, however.What I have experienced is uneven implementation where my PC's goals were at least incorporated into play up to a certain point, but then things would just go suddenly left turn off into whatever the GM felt like doing or die on the rocks of some impossible to anticipate unrevealed setting details or something. The process of play in well-designed narrativist games is just different and fundamentally better suited to this kind of play.
Simple example: your goal is to become Emperor of Catallia. You're nicely on your way to getting there when Catallia unexpectedly gets invaded by the Deshuanti armies and ends up almost annihilated, with its power structure in ruins.
The GM might have known this was coming for ages but couldn't exactly tell you, without spoilering the campaign, your goal was likely going to end up unattainable due to external factors.
On a broader note, I guess that's a big thing for some as well, including me: we don't like spoilers and we do like being surprised, even if-when that surprise isn't in our favour.