> It’s complex. Just as complex as C++. But C++ had legacy and Rust had not. The complexity of forcing your way through the jungle of Arc<Mutex<Box<T>>> on every single step directly impacts the quality of the logic being implemented i.e. you can’t see the forest for the trees. Once again, C++ has the same problem, so what’s the point of the language switch in the end?

Without trying to evaluate a claim about which is more "complex", since that's somewhat subjective (even if I do have some feelings on the matter), I can pretty definitively state that the vast majority of the concurrent code I've written in Rust has not used Arc<Mutex<T>> at every single step (and I don't think I've _ever_ used `Arc<Mutex<Box<T>>`, which would be like having `std::shared_ptr<std::mutex<std::unique_ptr<T>>>` in C++). It's totally valid to argue that the learning curve for Rust is sharp, but I don't think they've made a great case for it here generally rather than just for their specific experience. This even further implied by the idea of a "language switch"; I've been programming Rust for a decade, and I only learned C++ after learning Rust, so from my perspective, I'd have to "switch" to C++ from Rust, and it seems similarly pointless to do so. (I understand my experience is probably atypical, but that's kind of my point; everyone's perspective is different, and I don't think that making an argument based almost entirely out of subjective personal experience speaks very well to a "core problem" in a language unless you can speak to why that's representative of the general experience most people have, and I don't think they've done that here at all).