Because all proprietary steno software builds in a 1.5-second buffer between when the stenographer enters the stroke and when the stroke is transmitted to an external program. Imagine having to wait 1.5 seconds for each command to execute. It's infuriating. Plover is the only steno software that uses a length-based stroke buffer rather than a timing-based one, so it sends commands immediately, making it work beautifully with Vim and every other external program I've tried it with. The difference in usability is startling.
Ah, ok. I was actually thinking of something different: implementing steno chords in vim itself, instead of hooking it to an external program like plover. Since vim-arpeggio already handles simultaneous keystrokes, it seems it'd mainly be a matter of importing all the chords into vim-arpeggio.
But I didn't know anything about steno before today so I'm probably over-simplifying. And it's pretty interesting that plover can work with vim...I'd love to see a blog post or screencast showing how that works.
