Because we are working far from our customers, communication must be as accurate as possible.
A drawing only, done by hand is still subject to interpretation. The dimensions are not accurate.
We now have the chance to use tools such as assisted drawing software, with these one we enhanced the precision to avoid misunderstanding between our customer and us. For our customer the design aspect is more close to a finish piece and for us we can set the dimensions by providing a 1:1 drawing.
If we go back to our previous example. We finish already the sketch and from the sketch we now have the CAD (Computer aided design) in 2D