Their description made it sound like a really cool lower-level tool, so obviously it ends up being a letdown.

Drawing/art programs generally have a line smoothing feature - just smoothing your wobbly lines as you draw, using relatively simple algorithms. The description here made me hope for something more "medium-level", half-way between the two. It wouldn't just smooth your lines - it would adjust them according to context, based on a corpus of more precise line drawings, and perhaps predict/suggest the next strokes. It might be difficult to pull off though, if implemented naively it would probably just work against the artist.