I'm pretty sure GP is referring to Perl 5, not the newly renamed Raku. Perl 5 had a lot of use in bioinformatics, and to my knowledge lasted quite a while after

I'm pretty sure GP is referring to Perl 5, not the newly renamed Raku. Perl 5 had a lot of use in bioinformatics, and to my knowledge lasted quite a while after the general Perl exodus, until eventually being replaced by biopython. If the confusion regarding Perl 5/6 never happened, it might have retained that popularity in that domain.