Perhaps you think now: What is the point of that?
Well, the player could use it to plan complex facilities, or make a note on a belt to remeber what kind of Items will it transport and things like that.
Maybe it will be possible to copy parts of the drawing board and paste it onto other places and perhaps there will be a export/import-function to share this parts with other players in the forum or in multiplayer.
Well, maybe I'm the only one person, who's thinking this would be a really cool feature, but I can imagine, other people also find it interesting

Sorry for my bad english, by the way.