Brother Praetus said:
I don't know. I dislike the change given the experiences I've had and am having with the game I'm in.
-=Brother Praetus=-
I would say some rules plain hurt to change in existing campaigns, especially if people have built characters and encounters around a different interpretation (previous RAW); in my past experiences my group would simply hold off on implementing changes like this until the next round. Or at least allows the player who is boned by said change to make character alterations to fit with the new direction. I hope for your Adept's sake your GM does the same.