For starters the unsafe Rust could that interfaces with other languages can still be traced to an extent and https://reddit.com/r/rust/comments/9wxwi1/_/e9o3tts/?context=1 like this person said it could also be used to make specialized abstractions
https://nora.codes/post/what-is-rusts-unsafe/
and there could be some cases where these might be necessary for your code.