This here, this very thing is the reason that I am a Paizo fan.
Many other companies would simply write the material, playtest it themselves, then ship it.
But Paizo let's us, the consumers, playtest it. They let us provide feedback.
And what's more: They listen.
Even now, on day 2 of the playtest release, slight modifications to the classes are being made based on the voices of the customers (warpriests get proficiency wit their god's favored weapon.)
The developers listen to us, because they want to see as good of a final product as we do.
So to all of you developers out there, and to all of my fellow fans and playtesters.
Thank you.