The big challenge with leaving core data structures and interfaces to the community is fragmentation. If you look at the rust/go numerical communities the big

The big challenge with leaving core data structures and interfaces to the community is fragmentation. If you look at the rust/go numerical communities the big struggle has been a lack of universal ndarray implementation. Most numeric libraries can be Described as functions of/on ndarrays that return ndarrays, not having a language wide ndarray is the equivalent of having every library carry it's own unique list interface/implementation.