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Wraith constructs *aren't* machines as such, though. They're made from a semi-living material, Wraithbone, and animated not by electric wiring and servos but by psychic links to the spirits of living...

Yeah, they're not fragile at all when you properly account for what the Super-Heavy vehicle rules mean. Sure, they're on the fragile end of Super-Heavy, but that still puts them in a whole different...

Just in case you missed it, we've known the Wraithknight is the successor to the Epic Eldar Knight since they were released; Jes said so in that WD's interview.