Falcons and Serpents are vehicles that basically use Wraithbone where Imperials would use metal (only much, much more advanced).
Maulerfiends et al are metal-based machines that a demon has possessed. It can exert its will over it, even at times (5+) when the mechanism was destroyed.
Wraithlords are piles of Wraithbone, animated by psyker/soul energy. It has more in common with a greater demon than a walker. It has no internal mechanisms to damage. Not even redundant organs. Until the body is completely deformed, it is still fully functional. You can't break a belt or breach an engine.
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