Yes, you right according to "deterministic" but you forget about overhead. Rust gives you more safe control on memory management and in most cases, you can always write the fast and efficient safe program without the overhead. Rust give different smart pointers and even sometimes when you 100% understand what are you doing you can use unsafe raw ptr.

Yes, there is a trade-off of course. I think Swift is in the middle on Usability - Safety axis (C++ being on the left and Rust on the right extremes).

For certain programs a GC can basically make a programming language completely useless (no shared libraries with C abi, no realtime audio, videogames with stutter) regardless how fast the programming language is. This is not the case for swift. It's merely slower than rust.

Also to note that Swift has bindings to the 2D, 3D and real time audio APIs on Apple platforms.