They used to say don't record the talks unless it's for a family member - I guess if they were sick and didn't make it.
In reality, it made it easier to deny that any specific thing had been said from the podium. It allows them to wiggle free of responsibility. But there are a few talks that made it to the internet that reveal what was really said.
I wish that I had a recording of the assembly probably 10 years ago, that mocked the very people that had followed the WT encouragement, that 1975 was going to see Armageddon. That was coupled with Harold Camping predicting a specific day for the end of the world. The speaker even gave this slow Ha Ha Ha over it. It made me so mad because sincere people had given up homes and businesses to pioneer or do more. Just two years ago, they had a video that called those followers, weak spiritually for "following a date" Yes, it was a date that the WT promoted.