I like raku's grammars, and I appreciate the idea of having them as first class, in a way other languages don't have them.

But you have parser libraries that work very well in all major languages, and I'm not sure being integrated in the language makes Raju more valid for any project.

What it does, imo, is offer a special way to solve some stuff by already being there. But it's like saying someone would choose python for a project because it has a built-in set data type.