I think what he meant is that the compiler gives you certain guarantees that in some cases will mean that you don't need to directly use atomics and mutexes at

I think what he meant is that the compiler gives you certain guarantees that in some cases will mean that you don't need to directly use atomics and mutexes at all. Rust still allows you to arbitrarily harm yourself, but it usually makes sure you are more clear about your intention to do so.