Python 3 had a HUGE impact on existing code, yes. Everything broke. But Python 3 didn't actually change much for the people writing new Python code, it just broke the old code.
Raku is a completely different language from Perl. Writing Raku instead of Perl 5 is like writing Rust instead of C++.
Raku is a completely different language from Perl. Writing Raku instead of Perl 5 is like writing Rust instead of C++.