What I find interesting about that spectrum is that it's also suggested by the tension between character and plot. It's extremely difficult to make both equally important. It's much easier to either sketch out the character motivations and then see what kind of plot happens to them, or, to sketch out the plot and then see what kind of characters that would suggest. But to do both at once is a real challenge.

It's also similar to songwriting in that sense. If you want to write a really good song, do you write lyrics first or music first? Generally speaking, if you pick one or the other, you'll find that one "serves" the other. Writing both at once, though... that's really hard.