So you can buy books on stuff that you (presumably) already know, but not anything that would help your growth as a professional? Seems a little backwards.
Yeah, this is a bit more strict than I'm use to with a growth fund. Like I said, I couldn't buy a book on elixir since it doesn't relate to the day to day, but I could buy things about professional growth or things like "How to Win Friends and Influence People" or programming books that aren't explicitly about a language we use, but tangentially related to the day to day (Swift/Kotlin book to help with mobile, even though we use React Native)