You're right, I phrased that wrong. I didn't mean it has to be 100 percent story, 0 percent interactivity or 100 percent interactivity, 0 percent story, with nothing in between -- I only meant to say that one comes at the sacrifice of the other. Using that simple math again, you could have 60/40 interactivity/story, or 70/30, or 10/90, or whatever.
The point is, you can't have 100/100. You sacrifice one for the other.
And if you sacrifice fun for either of them you lose.