[mbq]

I bet the author calls for making functions just right in size to leverage self-containment and complexity, instead of panicking after crossing some magical number of lines.

This is actually compatible with DRY, because overpartitioned functionality will require more state to be pulled from function to function, resulting in repeating, long argument lists.

[marrs]

More basic than that, it also forces you to physically move away from the function in order to continue reading. It would be like turning to a different page in order to read the middle part of a paragraph.