I don’t think the main purpose is concurrent memory access considering the enormous share of memory managed by the borrow checker which is never accessed in a c

I don’t think the main purpose is concurrent memory access considering the enormous share of memory managed by the borrow checker which is never accessed in a concurrent context. Whichever purpose is the “main” purpose hardly matters anyway—the fact of the matter is that Rust makes memory management quite burdensome even though it makes it easier to ensure certain correctness properties.