While this is true, let's not forget that if there's a problem in the unsafe section, the issue can manifest itself much later in the safe code.. I'm not a Rust

While this is true, let's not forget that if there's a problem in the unsafe section, the issue can manifest itself much later in the safe code.. I'm not a Rust programmer but I remember reading about such kind of issue (an alignment error if memory serves). So sometimes you can build a 'self contained' unsafe part made safe with the right API but not always, which is already a significant improvement over other languages which are unsafe all the time..