I'd like to hear more about the Rust rewrites you've coordinated. Why do you think Rust took longer to change than Python?

I've felt this a little bit, but can only theorize why; the borrow checker makes mutability into a viral leaky abstraction, such that a change over here can sometimes cause widespread refactors on other components that would be decoupled in other languages.

Jury's still out on whether that's healthy long-term for a codebase, especially once the original writers have left. Jury's also still out on whether it encourages us into better architectures to begin with. Maybe it evens out, maybe not!