In my writing classes, I always assign reflective essays or self-assessments for finals. This is perhaps a fourth reason for doing a "final exam." To allow students a moment of reflection, where they can connect what they have learned with previous experiences and their future professional goals. This really is quite natural in writing instruction, and we've been doing it for decades. I love thinking about this for other classes where it doesn't seem so natural. I particularly like the idea of mind-mapping the course or rewriting the catalog description. Very low stakes, but we could learn some interesting things!