[scns]

Error messages could be better, Elm has set the bar in that regard.

Types are inferred, i only had to write a type once to disambiguate. Fearless Refactoring. If it compiles it works, except if you built in some logic errors. The compiler will find all syntactic and type errors, which might feel annoying at first but if you reframe it into the compiler is helping you then it is fine.