Desirability of the editing experience is a function of the kind of editing one does: I mostly write text-heavy stuff, blog posts, README's and similar stuff. For these stuff, I am quite happy with markdown, vim and the general workflow of mine around these tools; and I like that workflow. I do not need a piece of text to be red, or be centred, or wrapped around an image. Still, me and alike are the minority;
normal people want these kinds of stuff.
For instance, I've deployed (!) a couple WordPress blogs and a PhpBB forum for a friend (yes, I'd touch none of these for my projects). When it was time to test-post in the forum, I started explaining him the markup for PhpBB. His reaction was this: "But in vBulletin, there is a text editor. I think I'll pay them $400 for that." He wants to centre the text, and emphasise phrases via colouring them red. Because he can. He is a normal person.
While I like my workflow, with markdown, vim, and a static site generator; I do not find markdown and alike useful for any major inscription, e.g. papers and books and alike. I'd rather use a suitable tool that takes away the burden of manually writing the markup, and allow me to focus on content for such work. iA Writer makes me horny, but unfortunately I do not own a Mac. I admit that I'd go nuts should I need to write a book in, say, LaTeX (or however it is spelled). Yet, the problem of portability of files is a superior problem than lack of convenience while editing. If I write my book with iA, and if it goes next year, what'll I do?
