Sort of a different case. People type pretty fast on keyboards, so completion for speed gain is pretty marginal. A big benefit of coding word completion is just

Sort of a different case. People type pretty fast on keyboards, so completion for speed gain is pretty marginal. A big benefit of coding word completion is just remembering the right thing to type (was it foobar or foo_bar or get_foo_bar?), which isn't the issue for typical writing (you can forget words, sure, but usually a thesaurus is what you need to find it). Could still be room for it though