Hard disagree, the point of the talk is the Q&A, otherwise I can just watch it on YouTube. I design my talks so the rehearsed content is only the preamble. The rest of the time is spent in discussion. For an allocated amount of time, I create a talk that is 1/3rd the time and then supplemental material that can fill another 1/2 if the crowd can’t be warmed up.

But there’s an art to Q&A that’s as hard as public speaking but practiced by 1/10th the people. A simple hand vote is the most basic tool. After a Q, I’ll summarize it and ask how many people face this problem? Etc. why get an audience of people in a room if you don’t use them?