No. For Gen 2 and earlier, the problem was with the cones: they were soft, so wore unevenly and produced unacceptable amounts of play. People used to buy Dura-Ace cones and grind off a bit to make them fit. That was a pain in the butt.

In addition, the electronics in the G3 hubs is more localized to the end cap, so if anything wrong happens there, you can just mail back the cap rather than the whole wheel.