It's quite a leap from "certain observable behaviors of the runtime" cannot change to Go is a dead-end. Go regularly makes runtime changes and language changes

It's quite a leap from "certain observable behaviors of the runtime" cannot change to Go is a dead-end. Go regularly makes runtime changes and language changes, see https://go.dev/blog/ https://go.dev/blog/. Some highlights: - Iterators, i.e., range-over-function - Generics - For loops: fixed variable capture - Optimized execution tracing - Changing the ABI from stack-based to register-based.