I'm not taking anything away from, Rust, it is a great language for CLI developer tooling. But in fairness you'll find a plethora of tooling written in all popular languages these days. This is also true for a great deal of "uncool" languages too, like Perl.

I also think newer languages benefit from the fact that CLI developer tooling is a great "hello world" type project to work on. Such projects solve a very real problem that someone starting out in that language wants to solve, while also often being simple enough problem to learn that language in.