Wow! I was just reading some posts and stumbled onto this! The tension from this guy’s EX-5’s D and G strings pulled the nut out of the slot!
The string retainer is a necessity, but it would look better if the strings bent around a roller. Guitars and Basses with the hockey stick headstock sometimes have this issue. I’ve used a black zip tie behind the nut to lock the strings into their slots. I had a bass with the E string pulled to the side. It popped out of the slot one too many times.
A bass locking nut would also be a solution.
They really should design a headstock that pulls the strings straight, not at an angle like that.