For a writer, the computer (or not) is simply a matter of process just like bashing or swooping. And the world is entirely different for a full time professional writer than for ordinary people who write (I have made the statistical assumption that you are not a full time professional writer).
I mean the waste basket full of the morning's failed pages is a real thing, and if your goal is 500 good words a day, you're potentially in the novel-a-year range.
For what it's worth, the main ideas can go into an outline -- a step the computer encourages skipping. Here it looks like Graham was working from an outline via the ten idea structure. Maybe all first drafts are not equal?