Understanding s-expressions isn't hard, but reading s-expression code quickly when you're not used to it is very slow and frustrating. Fluency is essential for

Understanding s-expressions isn't hard, but reading s-expression code quickly when you're not used to it is very slow and frustrating. Fluency is essential for efficient use of a language, and breaking people's already-existing infix fluency is quite a hurdle (or certainly appears to be from the outside).