The topic is "Arenas in Rust" not "Arenas in Rust or anything other tradeoff."
Indeed, the topic is "in Rust", so you'd do arenas in Rust due to those memory safety benefits outside of arenas. And since arenas aren't as bad due determinism etc, it's still a net benefit: safer outside, safer inside
Indeed, the topic is "in Rust", so you'd do arenas in Rust due to those memory safety benefits outside of arenas. And since arenas aren't as bad due determinism etc, it's still a net benefit: safer outside, safer inside