The hidden chainring bolt, while a pain in the ass and kind of ugly, is a result of getting rid of a pair of stress risers - on cranks where two of the spider arms straddle the crank arm, there's a small angle where cracks can start, because the web is thin and is subject to constant stress cycles (see old Campy cranks for a popular example). When one of the spider arms is moved under the crank arm, those angles are opened way up and the stress risers are greatly reduced. Sort of like the point on the bb end of the Ritchey logic crank - it looks weird, but prevents the crank from cracking from one corner of the square tapered hole.
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