[Origami] Is there a justification for crease lines not contacting the edges?

[Jorge E. Jaramillo]

Hi,

In Robert Lang's article about diagramming conventions that can be read at
his webpage www.langorigami.com next to Figure 4, it reads "Crease lines
should not contact the edges that the creases end upon. They do touch edges
that they go under". Does anyone know a justification for this? I find it
odd that creases should not be shown in their full extent.

-- 
Jorge Jaramillo