As David Kolb puts it, argumentation and exposition need some structure.
That structure may be arranged in a linear fashion to be encountered step by step, though it seldom written that way even in standard philosophical texts. Few writers try Spinoza's "geometrical mode" of writing, and even Spinoza includes notes that expand and relate his points. Most authors distribute their argument in large chunks that may or may not be presented in a linear order, nor presented only once or only in one way.
