Another advantage is that the speaker doesn't always get the question. Either can't hear it well, or the question itself is weird, complex, off-topic, or some variation on not-even-wrong. So they end up answering something else. If they repeat/summarize the question first, at least they're answering a question, and when this happens, the question which gets answered is often better than the one which was asked.
It happened so many times that I had no clue what someone asked, and the presenter repeats the question with their own words, usually much more clearly communicating the question that was asked.
Just go find the speaker later and ask questions if you have them.
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?