[lytedev]

The core of this argument taken to its extreme kind of makes the whole discussion pointless, right? All the languages can do all the things, so why bother differentiating them?

To entertain the argument, though, it may not be a language issue, but it certainly is a selling point for the language (which to me indicates a "language issue") to me if the language takes care of this "library" (or good defaults as I might call them) for you with no additional effort -- including tight compiler and tooling integration. That's not to say Rust always has good defaults, but I think the author's point is that if you compare them apples-to-oranges, it does highlight the different focuses and feature sets.

I'm not a C++ expert by any stretch, so it's certainly a possibility that such a library exists that makes Rust's type system obsolete in this discussion around correctness, but I'm not aware of it. And I would be incredibly surprised if it held its ground in comparison to Rust in every respect!