Being free to make mistakes provides an opportunity to learn. On commission, or if your own personal investment is high, the possibility of making a big mistake is scary. Digital kind of rules out total failure (unless your cameras/computers go bang) and that rules out a lot of happy accident too.
The last time I went into the studio I used a twin lens film camera and only put the close-up filter I like to use on the taking lens, so all the pictures where blurred. Actually I love the soft images no focus produces but somehow can never intentionally bring myself to screw-up the focus. So fate did it for me.