The real problem here is that Go does not allow a user to create their own powerful concurrency primitives. Locks exist, but you can't create a synchronized da

The real problem here is that Go does not allow a user to create their own powerful concurrency primitives. Locks exist, but you can't create a synchronized data structure. You can't create your own channel type because that's a generic thing which is reserved for the language authors, not the language users. The whole point of modern programming is to create useful abstractions that allow a programmer to get things done without having to worry as much, and concurrency-related abstractions like parallel map-reduce and actors are powerful, but you have zero chance of making an abstraction for that in Go. In Go it's basically CSP or bust; saying "you can use locks" is not an answer; locks are not a way to handle concurrency, they're a primitive for shooting yourself in the foot if you're unfortunate to be in a language where you can't abstract them away suitably.