Right. If your goal is education PowerPoint is fine. And I'd argue that it should be a video. No need for me to go to a room to listen to a presentation when you want me to attend. The modern conference where all presentations are on the web is ideal.

Now if you want discussions, that's a whole different matter. I've used PowerPoint for discussions. Usually one slide to frame the discussion and a second slide I leave up that has the goal of the discussion -- that is, what are we here to answer. You could just as easily do it with a printout or on a whiteboard, but a PowerPoint is often logistically easier. The keypoint though is that a discussion should have a clear goal. If you can't put the goal of the discussion down in a sentence you probably aren't crisp yet as to what you're doing.