Not all changes that are being implemented are open to modification. I will agree that it would be useful for the playtest packets to specify which changes are up for discussion, and which are not. I also believe that it's entirely the right of the authors to state that some changes -aren't- up for discussion. Example: Golems are going away. The intent of the playtest, truly, is to get feedback on some things that are, such as spell verbals, Powerful Blows/Flurry, build pre-requisites, impact of Hearty, impact of Healing changes, etc, etc, etc. There's plenty of things in there that are -totally- up for discussion, from what I've seen.
If you don't think you're going to have an impact on the rules that matter to you, I don't know what to tell you. The Owners have always been the authors of our ruleset, this has never been a democracy, or presented as one. The Owners seem to be working as best they can to provide a ruleset that works for everyone, and -that's not an easy task-. They are gathering data, and player participation is important for that, but there are things -they don't want in their game, for whatever reason, and they have the right to make that call-.
The Playtest packets have already changed from the original launch to the 0.8, as a result of player feedback; implying that player feedback has had zero effect on this is simply wrong. You're taking "player feedback does not have omnipotent impact" and translating it to "player feedback has no impact." You and I both know that's extremely erroneous, even disingenuous.