Your point being, that a secondary information channel is necessary because the whiteboard drawing itself isn't complete? I guess a lot of times formal errors

Your point being, that a secondary information channel is necessary because the whiteboard drawing itself isn't complete? I guess a lot of times formal errors and the like will happen on whiteboard. So no, the drawings probably aren't precise enough. The process needs to be a dialog. Similar to the interaction you have with your compiler: You provide stuff. "Computer says no" (or tells you what is missing/etc) You alter your stuff and give it back to your tool. That loop repeats. Something similar will be necessary for "whiteboard programming". I guess it is not as trivial to convert drawings to code as I stated. But it still a tedious task that should be automated as much as possible.