I'm sorry but I disagree. Mature Rust is not the same as mature C++. If you are a commercial entity you would, in my opinion, be fool-hearty to select a language like Rust, mature in the sense you mean or not, as the main language of use. Or at all quite frankly, for the single reason that it is more difficult to employ quality people as the talent pool to draw from is far too small. And it is also the reason I never invested myself to learn it, for its technical merits or not.