I'm not a robot, I can't just digest an 1 hours worth of spoken data easily or efficiently. We have visual aids and such because of limitations with human attention, how we remember things, etc.
Amazon is famous for its no powerpoint culture, but meetings there start with everyone being handed a 2 page memo, and everyone spends the next 10 minutes reading it and making notes on it. That has practical limitations as 2 pages only covers so much and you are not allowed to ask questions during the read. You can only read silently and hopefully you remember your questions for when Q&A is allowed.
Visual presentations are more fluid, allow for slower intake of longer sets of information, and make an effort to keep the attention of the listener. Not sure why that's so awful. I suspect most people have PP as a placeholder for things they don't like about working a job in general.