It might not be a feature, but it is a selling point. It conveys that it was written relatively recently, is more likely to support modern features in the shell, runs reasonably fast and is reasonably portable.

If it was written in JS or python I'd already start worrying about what package manager to install it with in which environment, installing it globally is an anti pattern but symlinking it to .local/bin might complicate it.

So IMHO, the language something is written in is not just an implementation detail, it informs me in how well it will perform.