There isn't really much of a statement or judgment on Rust. At most there's an interesting point on it's value proposition:
> However there is a rampant fiction that if you supply a new safer method everyone will use it. For gods sake, the simplest of concepts like the stack protector took nearly 10 years for adoption, let people should switch languages? DELUSION.
This is mostly true. Developers in particular don't generally care about security, so selling Rust as a "secure" language is not going to be enough. I've said this since 1.0. But it's not entirely true for products, which often drive development - Chrome's pairing of performance and security led to tons of marketing wins.
Given that tools like "cat" etc are:
a) Not generally security sensitive
b) Target developers
I don't see anyone choosing the "rust cat" over the builtin. This is why people build tools like "bat", that aren't just memory safe copies, but they're memory safe tools that add features and target slightly different cases.
Not much else to get from this post, I think.