The Rust rewrites can become tiresome, they have become a meme at this point, but there are really good tools there too.
An example from my personal experience: I used to think that oxipng was just a faster optipng. I took a closer look recently and saw that it is more than that.
See: https://op111.net/posts/2025/09/png-compression-oxipng-optip...
If a new tool has actual performance or feature advantages, then that's the answer to "what problem does it solve", regardless of what language it's in.
Bingo.
> but there are really good tools there too.
That's the problem. How good they are ? Who can tell ? The basic UNIX tools didn't come in "one day" like most of these "rust tools".