It depends what is meant by "unify" and what is the "stack". What I just read that a language is meant to "unify the full stack", I think I'll be able to rewrit

It depends what is meant by "unify" and what is the "stack". What I just read that a language is meant to "unify the full stack", I think I'll be able to rewrite with it any piece of the stack used, including my graphic driver, the network stack, etc. I believe most modern application are relying on underlying elements of "the stack" that need to be fast/low latency enough when interacting with each other. Unfortunately the C ABI is still king there...