The base material needs to be of a minimum quality for that experience to be enjoyable, I presume. I totally see the value of that, which is one of the reasons to sometimes reduce playback speed below what my default would be. Writings from Tolkien are maybe some of the best suited for that, but I'm not 100% convinced it would work for what I'm reading currently, so I might just try it anyway - the Foundation series from Asimov.