Doesn't that depend what sort of thing you're writing?
For me, not really. I find any writing is easier in fixed-width. The first thing I do in any GUI mail client editing box is set the font to fixed, if possible, otherwise my messages are even more garbage than usual... I really don't know why it is so. Perhaps my subconscious does not get enough feedback when hitting a symbol that is very narrow in proportional fonts, and hits the key again?
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