If you try to close the window after you've typed your say, the dialog box offers "discard" as the default option. It assumes you don't want to bother to save a draft, which suits composing for the medium perfectly.
Dust-proof and dirt cheap I think are the big selling points for the rest of the world. My old Nokia 6010 has been frozen solid twice, immersed twice, and it still works. Its SIM card is in my iPhone.