In some respects, ThoughtStreams gives you an instant "Hemingway mode" for getting down your thoughts.
It encourages you to put something down, save or even publish it, and then continue to add to it rather than continue to futz around editing what you've already written.
Of course you can go back and edit later, but ThoughtStreams gives you permission to get stuff out as you think of it, setting the expectation that it is a stream of thoughts that will evolve.