1. It doesn't give you that necessarily, see Go.
2. Rust doesn't have memory management like in C. In Rust, abstractions and the compiler manage memory for you, except when you opt into C-like memory management using unsafe.
3. The comment was about memory safety, not memory management, and its benefit.
4. In case of GC vs manual memory management was used as a speed comparison: You might not REALLY need the speed of Rust, but I gladly take it where I can. I am tired of sluggish resource hogging electron apps and similar. Electron probably destroyed at least 10-15 years of progress in hardware performance gains.