I'm guessing from this video and the JJP livestreams that when they went to code the spinning disks to give out random awards they couldn't get it to work. A couple of months ago they said that they were going to show the random awards in the next stream but that never happened and they went silent on the random awards. Perhaps there were also other long-term reliability issues with the discs that only showed up after a couple of months of testing. Then there was also the noise problem. So after taking these three things into account they must have reluctantly decided to let it go.