Lamenting any 'not even criticism' of Rust as 'denialism' is just evidence of the insane cult that is Rust.

Rebuilding Claude Code in Rust will make almost no difference in terms of real world performance. V8 is 'relatively fast', and there wouldn't be any noticeable improvements there, and probably not memory footprint either.

The source for Claude Code was leaked and it's a vibe-coded mess, there's not much thought given to clean architecture, it's unlikely they've just cleaned up a bit and given thought to memory consumption etc, if they did, they'd get by far most of the way there and likely abnegate and real want to 'do it in rust', unless there are other architectural considerations.