Raku has a healthy and stable community that is making steady progress in developing the language. Joint us on IRC or Discord (see https://raku.org for details) to get a feel for the activity level. For me it is an opportunity to hang out wiht very deep knowledgable compiler core folk and I have learned tons.

The big effort going into v.6.e (ie the 5th major release of Perl6 == 6.e) is Raku AST which is now in PREVIEW and is a big boost for writing Slangs (Raku sub languages) since you can now use the built in Grammar parsing to generate AST code - and is the precursor to macros and improved JIT optimisation.

The Raku spec is actually the ROAST test suite https://github.com/Raku/roast and Raku has been compliant to this since 6.c which was the first production release.

Raku can run Perl5 CPAN modules (Inline::Perl5) and Python modules (Inline::Python) out of the box and it has deep FFI C NativeCall facilities. There are also a couple of Raku + Rust exemplars such as Dan::Polars (note: I am the author).

Raku also has some very nice modules - Red is an ORM that leverages traits to make OO/ORM seamless, Cro is a web server framework that uses concurrent features such as Supplies to enable pluggable middleware (think WebSockets).

As to larger adoption, I would say that this is still slow - there are some reputational concerns around the Perl to Raku transition and some points have been made about slow execution speed (although I would say that Raku is no slower than Python / Ruby were at this point in the development curve and of course there is no GIL limitation and many built in features for multi core such as hypers).

At the moment, I would say the "killer app" for Raku is the use of Grammars in conjunction with LLMs (language meets language) - take a look at the work of antononcube for some great use cases... https://raku.land/zef:antononcube/LLM::Functions

For those interested in the last remark and unfamiliar with grammars: https://docs.raku.org/language/grammars