Would have thought it's a matter of preference, really?
Unless you've hit on a secret nobody else has, there's no way to access B3D's depth buffer with enough accuracy to use it for shadow systems, so while the Wolfire article is very interesting... it's also referring to a system that can't be used with this particular engine.
(For the sake of interest, the closest thing to depth-based shadows I've seen anyone manage in B3D is this: http://www.blitzbasic.com/codearcs/codearcs.php?code=2792
It's really cool to look at but sadly not usable in a realtime system.)
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