I was at one a few years ago. The assigned speaker still had to give the talk. I thought they could have cut everyone some slack and broke for lunch early.
JWs lack basic common sense. It comes from years of practising obedience without thinking for yourself. Then again, they probably receive instructions from Watchtower to carry on in these circumstances. Watchtower doesn’t like to leave anything to chance, especially when there is a danger local people might make independent decisions that suit their own needs. That sort of madness needs to get stamped out quick sharp.