No doubt, the content is the essence of all presentations. All tools are just aids.
As you suggest, we have been perfecting presentation for thousands of years. To an extent, powerpoint has captured some of the best ways of communication in my opinion. In particular, the ability to annotate a picture is one of those. After all, a picture is worth more than thousand words.
Having said that, there are many ways of communication. Our existing presentation tools have only captured a few of them. We need more.
I'm sure there are older presentations, this is just the oldest one I can think of looking for. Humans have had thousands of years to perfect giving presentations. Coming up with something better is something we are unlikely to do because many things have been tried, and the worst have been discarded.
You might argue that Socrates didn't have any presentation, but I would argue right back that if you presentation cannot stand without the visual aids that is a problem you should fix. Once your presentation without aids is good the visual aids can help.
Note, the above is the ideal. I do not claim to be good at giving presentations.