Tools are useful. This does not mean they are precious. My landscape plans are a two-dimensional description of a sculpture which is to come. They are not an end in themselves. I go over them with my superintendent; we do a layout. That plan usually ends up in a lunchbox, a back pocket, or after it is irreparably wet and mud smeared, in the trash. They are a means by which to communicate.
There are computer programs which help projects to get drawn quickly. I use them to draw very complicated structures. They are very useful in detailing changes to this and that-without having to redraw everything. But I am most interested in the evidence of the human hand. I draw by hand, as that drawing is part of a process which is distinctly my process. My clients find out that as I respect the evidence of my hand, I have the ability to respect theirs as well.