I understand that the changes on the Rogue comes as a bit of a surprise, from first appearing on the Beta server and needing to be confirmed still and I do want to apologize for that and will make sure to get this improved with the team.
Now I did ask Grou to explain further the Rogue changes and here is what he said:
"The limitation on Wall of Flame is to prevent AI abuse, but it is planned in the future to review the Fire Rogue to give more flexibility. Regarding Piercing Shot, it was simply too strong but if the change makes it too weak, then a review will be considered."
As usual, I will continue to share your feedback and I am also specially interested on the parts of the changelog that you still feel needs further explanations. I have already collected some but please keep on sharing them as it is important to have you understand them properly.