Yeah but I'm skeptical that there's anything about HN's software that's uniquely enabled by being written in Arc. I want someone to point to a feature in a Lisp

Yeah but I'm skeptical that there's anything about HN's software that's uniquely enabled by being written in Arc. I want someone to point to a feature in a Lisp and say, "you can write X software only in Z because there's Y feature". I'll even accept "significantly more easily" instead of "only" here. For example: "you can write secure kernels only in Rust because it has direct hardware access and memory safety" (let's stipulate this is all true).