I think the limitations may come from how the author saw the final product. I have a good example where audo works (in my opinion) better than text on "Measure

I think the limitations may come from how the author saw the final product. I have a good example where audo works (in my opinion) better than text on "Measure What Matters". Here you actually have some the people who had a significant impact on business & tech world telling their stories in their own voice. Most of the audiobooks are build as an afterthought on top of the original text.