...why would you prefer to reach for the "no true scotsman ...", rather than read in any one of two other places in this thread that you are dealing with fellow scotsmen here?
I can't debate Raku with you, because I don't know any Raku, because, why should I? Life is short. I do know Perl 5, and the only context where a discussion of Raku even makes sense is as an upgrade path for Perl 5. Upgrade path doesn't mean that a program written in Perl 5 should run with unaltered syntax and semantics in Raku and not panic. Providing an upgrade path for Python 2 was one of the primary purposes of Python 3, and they didn't understand it that way either. Upgrade path simply means: Leverage syntax and semantics and mental models already in programmers' minds and change them where necessary to trade off short term pain for long term gain. (But it's less pain than learning a different language altogether with completely different syntax and semantics and mental models).
I can give you a list of grievances I have with Perl 5. Maybe Raku addresses some of those. Maybe it doesn't. I don't know, but also, it doesn't matter. The late arrival of Raku means decades' worth of people using Python and other languages as an upgrade path for Perl 5 instead, so Raku addressing any of those grievances is now closing the barn doors after the horse has bolted. Any Perl 5 codebases still out there are run by people who are so allergic to the idea of having to touch their code, that Raku isn't an option for those folks either.
Having said all of that: Some of my grievances with Perl 5:
* No separate types of bytestrings versus sequences of unicode codepoints. Wherever there's strings in any non-trivially-sized real-word Perl 5 project, there is utter irreversible and irredeemable mojibake. This includes databases backing Perl applications, where they themselves don't have enforcement, so even if you threw away all of your code and started from scratch and just wanted to keep your data, Perl 5 would still haunt you from its grave. -- Having strings not be mojibake is easy as hell in 2026. Perl 5 makes this easy thing impossible, so I really don't share your idea of "make easy things easy"
* No canonical way to do object-orientation. (cf. blessed objects, Moo in different versions, and different conventions around how to use them) -- This stuff should be easy in 2026. Perl makes this easy thing really hard.
* Regexes suck. Their brevity is a nice circus stunt for a computer science audience, but unless you follow very particular patterns for composing them from ergonomically named constants, etc. etc. (which "in the wild" I rarely see), they are very unergonomic.
* Perl one-liners, and RSA decryption written in the form of a camel, make for nice t-shirts, but the same argument as above applies to them. There is no purpose today (but probably never was) in one-linerism because an LLM will knock out 10 lines of Python just as fast as 1 line of Perl, and reading those 10 lines of Python (which is the part that actually still matters) is more ergonomic than reading the Perl one-liner.
* The Perl 5/CPAN ecosystem has been left to rot and is no longer safe for consumption.