Maybe I'm being a bit naive, but intuitively I would think that most writers do not write a book with the explicit intention of the book being translated. The first intended audience is typically readers in the original language.

This is opposed by producing a series for Amazon, where it is mostly clear that the intended audience is world wide, talking many languages (in particular if it is about such a famous topic). And I wouldn't be surprised if this fact does impact the production of a work.