Good point - If you go off the left cog, the spokes would lead the chain deeper toward the hub, rather than away from it.

I keep my derailleurs well-adjusted. Never thrown a chain to the inside since riding my Schwinn Orange Krate in the late 60s I suppose it's possible though, as I've sure thrown the chain off the front rings a good number of times.

Not opposed to an ounce of 'Dork Disc' for safety, if it might matter. But I think I would rather have the more stable, balanced offset and sacrifice myself to the Dork Gods. I'm not hanging around racing types worried about appearances and egos. Saw a real cool light-weight Dork Disc on a high-end Kona recently.