I think it's more effective for Management as submitted questions can be selectively weeded out. By allowing random unfiltered questions at a live AGM reduces control of the agenda. Not all questions are wanted and not all answers will be heard for a variety of reasons. I believe it's about maintaining control when dealing with any disgruntled investors. Last years virtual AGM was cut short after just a few questions and many were left unanswered.  Hopefully things are different this year.