You have multiple good points. But I don't think that writing really requires Windows, that is a pretty extravagant claim. You can write with a typewriter or a text editor, it's not DTP. And I don't see how someone whose job is to operate sites like Twitter has any serious reason why they would need Windows per se.
I wasn't claiming it requires windows whatsoever. Word is available for mac as well.
And if you're the kind of writer that doesn't need it, you probably already are using docs, on your $300 netbook, and you really don't care. This isn't going to improve your life in any way, because frankly, a computer from 1995 would be all you need for writing. I'd say earlier, but you at least need a half-decent print preview.
