Any meeting involving PowerPoint can be an email instead. Just email the deck to people. If they have questions, they can either email you or request a meeting. But don’t interrupt people if all you’re going to do is make them follow along while you read through a presentation.
Problem is that this takes a lot of effort, because you’d have to separately provide a handout. So, I imagine, for most company-internal presentations, the slides are the handout.
Personally, I’ve never seen such a slide-handout which was self-explanatory (well, and handouts aren’t supposed to be).
But at the same time, the ‘presentation’ of the slides is often not done by the person who created the slides, and done with minimal preparation, so yeah, many times they just consist of the presenter reading the slides out loud and spitballing what they might mean on-the-fly.