JSF 2.0 will have bookmarkable URLs, which are used, for example, to retrieve a record by ID. In JSF 2.1 we intend to add page actions, which may change the state of the server with a GET, but those are discretionary cases to adapt to an action-oriented world (sometimes, it just has to be done).
I don't think we are disagreeing. You have to use GET + action that changes state for something like an activation URL in an e-mail. In this case, you don't have control over the client to make it a POST. But like I said, this is really up to the developer. The point is, JSF 2.0 starts to make the distinction possible...and correct by default. In JSF 1.2, it was POST or hit the road Jack.
-Dan