I like the look of this, and the draft-marking is a great feature. I'd worry about using it in earnest, though, because it of its limited export options, which

I like the look of this, and the draft-marking is a great feature. I'd worry about using it in earnest, though, because it of its limited export options, which require the formatting to be done outside Draft. It's great to be able to collaborate on creating content, but a lot can go wrong in that final formatting, and Draft doesn't have a way to make that stage collaborative and version-controlled. Everything I write could be written in Draft, but none of it could be finished in Draft, and I see that as a problem.