How can you honestly claim that the language is consistent when it didn’t use to be able to express a map without supporting it on a language level (instead of only being a lib)? A properly consistent language would be one where you could reasonably come up with how to use anything, including such a basic data type just from simple primitives. Go is very far from that.

Have a look at the excellent “Growing a language” talk by Guy Steele where he goes into great detail on what would a truly consistent language entail.