It is good for writing cross-platform scripts. It's easier and more powerful than Bash but not as heavy and cumbersome as Python.
Raku is the new name for Perl 6. They changed the name because there are backward incompatible changes in the new version, and they wanted to try to move away from the negative associations people have with Perl.
Perl has always been better than Bash at scripting, and Raku added some modern features to take that advantage further.
I've never understood the frustration over magic variables. It's always sounded similar to the complaints about var declarations when people are used to explicit type declarations. Verbosity like that just reads as attenuating noise to me.
I'm sorry, but I don't see the parallel between my and do {local (@ARGV, $/) = $file; <>}
Even renaming standard keywords, like next and last, adding unless... There was a whole book about best practices, and I wish Perl 6 followed that to the T.
My biggest gripe with Perl is the entire dimensions of possibility to hide effects. And Raku seems to have kept a lot of it, and added more stuff on top.