I'm confused. Here is a video of Federer in slow motion. He isn't extreme Eastern, but certainly closer to that grip than other players (Djoker, Nadal, etc.).
If you notice in the video Federer has his wrist laid back through the majority of the stroke. In fact, the wrist moving forward from its laid back position is more of a "by product" of the windshield wiper follow-through. If you pause at :41 or :56 you can see that the wrist is still laid back even after the ball has made contact and left the stringbed.