I don't think you can box it all up like that. Many obstacles you simply cannot just crawl over and momentum of some sort is needed. Controlling that momentum and keeping it smooth might help keep you from breaking, but the crawl ratio doesn't honestly come into play with an automatic like it does with a standard tranny.
With the standard tranny you would like a good crawl ratio so that you don't have to ride the clutch nearly as much and can creep, even 2 foot drive at times. With an auto, this never comes into play and you can raise the RPMs to reach the torque needed to apply whatever is necessary and do so very controlled by keeping it in first gear.
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