I recently tried the hill descent control feature on a steep trail the other day: it is pretty nifty!That's cause for the vast majority of people the non-rubicon T-case offers more than enough crawling capability on 4lo. Even on black diamond trails. But I agree, when doing really really hard stuff this def shows up.
Oh and on a manual tranny, crawling with the Rubi T-case. Huge. Auto tranny? meh.