The all wood construction was the main reason that the Mosquito was allowed into production at all. And despite the fact that the plane performed very well, all wood constructions was a dead end for high performance planes.
More realistically the Mosquito was a harbinger of the future in which aircraft would be built of composites. That the composites of the time were wood (birch and balsa mostly) rather than things like fiberglass, ceramics and carbon fiber is just down to technology of the day.
As to the manufacturing method, it allowed many very small firms to participate in the war effort where without the Mosquito they would not have been able to contribute at all. How efficient the design was for production, barring catastrophically inefficient construction which it did not have, is relatively irrelevant because of that as any efficiency was better than the 0 efficiency those workers would otherwise have been contributing.
