There are a lot of command line tools that are written in JS and other scripting languages.
Having the tools that are involved in interactive use be written in a compiled languages gives hope that they might be fast enough to not be annoying.
Me personally I do not install nodejs on my machines. So knowing that this tool is not written in JS is relevant for me.
???
Also, this tool replaces another which was written in Go, which I would put in a similar performance category as Rust. It shouldn't make a difference in this scenario