> Raku and Perl remain incompatible so e.g. the existing large Perl ecosystem can't be leveraged from Raku.

Au contraire, they remain compatible along the lines shown in this example from a StackOverflow answer[1]:

    use Text::BibTeX::BibFormat:from<Perl5>;
    ...
    @blocks = $entry.format;

I'll be happy to dialog about this compatibility, but the key thing is to start with an open mind; a recognition that the original vision predated Parrot; and a recognition that Rakoons have never relinquished that original vision even while many of us are delighted that Perl folk are keeping Perl healthy as a separate thing in its own right.

To be clear, the realization of Larry's original vision is not constrained to interop with Perl. Raku has extraordinary potential, some already realized, for pan-language compatibility via its Inlines[2].

The steady improvement of the exemplar Inline[3] for the last 6 years; its evident maturing; its suitability as a solid blueprint for upgrading all the others; all of this bodes well for being able to use a lot of the world's best existing code from within Raku this decade, with Inline::Python quite plausibly shining in this regard within the next 2-3 years.

[1] https://stackoverflow.com/a/45181464/1077672

[2] https://modules.raku.org/search/?q=inline

[3] https://github.com/niner/Inline-Perl5