I find the language mostly concise, i.e. new types / funcs / etc are about as small as they can be (without type inference), but the type system tends to result

I find the language mostly concise, i.e. new types / funcs / etc are about as small as they can be (without type inference), but the type system tends to result in an absurd amount of error-prone duplication and/or wrappers. And the wrappers that can clean up the duplication take a fair amount of work each time, and must be repeated each time, so they really only exist when there are dozens of places where it's useful, rather than some smallish number - everywhere else you just `if err != nil { return err }` and that just keeps accumulating.