Both Nim and Kotlin Native have a runtime in the form of a GC/automatic memory management, so you'd still need another language "beneath" them to get the job done.
In the system programming world, "simple" means having the program do what you tell it and no more, so that there are no surprises when you come to run it.
Rust has a very complicated compiler, and a moderately complicated syntax, but the semantics of the language are amongst the simplest out there - far simpler than C (purely because of the UB), Nim or Kotlin Native IMO, and that really helps when writing low-level code, or even just when contributing to an unfamiliar code-base.
In the system programming world, "simple" means having the program do what you tell it and no more, so that there are no surprises when you come to run it.
Rust has a very complicated compiler, and a moderately complicated syntax, but the semantics of the language are amongst the simplest out there - far simpler than C (purely because of the UB), Nim or Kotlin Native IMO, and that really helps when writing low-level code, or even just when contributing to an unfamiliar code-base.