The other day, a client needed a presentation meant for reading, something that would be sent out to the employees by email. So, we designed it for reading and used the fact that for an internal audience we could be a bit more radical with the format.
Here is the concept: a dark 16:9 background. Each chart has a big visual on the left side while the message of the chart is spelled out in full sentences in a relatively small font in a column on the right. Full sentences, because nobody will be around to explain what the abstract graph means. A narrow column in a small font because it is easier to read than a very wide sentence spanning an entire 16:9 screen.