1. rust handle erros in a VERY expressive way, and I do want my services to log ANY errors, and to be sure to miss any (kind of like what go permits too , but Rust Errors are more flexible) , so with rust it's hard to forgot a case of error and finished with "errr my API did a 500 but i don't know why"
2. It's a (nearly) self contained binary with low memory overhead, I can have dozen of microservices like this on my workstation / CI environments without making the machine cries So I can deploy it on cloud provider X or workstation Y without needing to worry if it has the version of node / python / php I need
3. it creates very small docker image if you're using docker (so it beats node/python/php here)
4. if I want to make my services multi-threaded and have some internal cache for some reason I'm sure the compiler will not let me create concurrent access problem that I would otherwise only detect in production when it's too late (beats every other languages , including go , the go race detector of go is nice, but it's at runtime so not the same league)
5. no nil pointer exception things (beat other languages here too)
6. strong typing but flexible (no go, I don't want to cast everything in {}interface everytime i need to make things a bit more generic, though I know it's just a personnal opinion), because no I don't want my developer to either develop a "is_true" function , or worst to rely on type casting for if to work.
7. the compiler as my first set of test it's a whole category of things you don't need to write test for because it's already handled by the compiler.
8. highlevel when you needs, low level when you want, I know that the language is not my bottleneck (or then I've reached the point where I don't care because my system is performant enough) , but if I need to serialize my struct into a json, I can in some line of codes.
9. plenty other little things , like scoping variables, immutable by default , possibility to have your SQL request check at compile time if you use postgresql plugin, using first-class debuggers to do step by step if you need , interfacing with C libraries pretty easily