Twists, cups, bows, and crooks--the four typical warps of wood, need a plane to "hog" off a lot of wood in the initial shaping. I bought a scrub plane (and it works great), but I tend to use a #5 or #6 much more often to accomplish that task. I keep a couple planes with camber and they work quickly. Once I prepare for jointing, I'll use a different #6 or an #8, depending on the length of the wood. As Patrick just said above, there's so many ways to arrive....