So, I don't know Rust, so I'm not going to try and voice an opinion that would be unsubstantiated.

As for your observed point 2 though: at some level, systems languages need to allow the twiddling of bits on and off, perhaps allow the direct interaction via assembly with the processor, have some notion of native word size, and perhaps also make simple common idioms in low-level programming (stacks, interrupts, and so forth).

It is very rare (in my experience, which may not be accurate) that these issues should be even visible at semantic layer concerned with mapping functions over data and other functions, with sorting sets, and sending messages. It's simply too polluted a headspace.