The right click report may have been around for 10 years in retail, but has the player imposed punishment has been tied to that right click report system for 10 years?
They may not see much of an issue with how it works in retail, which is practically a solo game played in a multiplayer environment for most content, especially with the LFD/LFR systems.
Classic is an entirely different environment. It is an environment that is not conducive to player imposed punishment and invites abuse, IMO.
It remains to be seen whether Blizzard acknowledges how right click report system interacts with the different environments in retail and Classic and adjusts the right click report system accordingly.