I agree on this point but I can also appreciate the desire for an in-house caliber.
I think there is no doubt that the current JLC and F. Piguet movents are more than up to the task at hand, and there is really no need to change them from a functional point of view. However, there is merit in developing and using your own movements in all your watches when taken from the point of achieving independence from suppliers (it is all a matter of balancing quality, and economies of scale/cost, I guess).
Now, the dilemna some must feel is that, knowing how beautifully finished a VC in-house caliber is, it would definitely be a shame not to be able to visually appreciate its beauty. And although I also agree that a sports watch should be robust and that crystal caseback may be a step in the opposite direction, I can still appreciate the completely human desire to have the best of both worlds.
Who knows? I am sure VC is listening so everything is still possible, right?