If you think of the "um"s, "uh"s, and doubling-back in speaking as the equivalent of pausing and pressing backspace in writing (or crossing-out in pen-and-paper

If you think of the "um"s, "uh"s, and doubling-back in speaking as the equivalent of pausing and pressing backspace in writing (or crossing-out in pen-and-paper writing), then I think the advice to "write how you talk" becomes even more direct.