I don't remember where I read this, but that reminds me of the "Perl Paradox" -- that if your job listing requires a "Perl programmer", you get worse programmers, even though a good programmer can equally well adapt to any language, including Perl. But if you require such a person, your only applicants will be people who could never adapt to a new language.
Edit: Ah, it's actually named that and I found a lot of results for it:
Interesting. I legitimately liked perl back in the day. The ability to do things like inline c code, etc. was great. But I've been immediately passing on any roles that mention Perl for a long time.
Edit: Ah, it's actually named that and I found a lot of results for it:
https://www.activestate.com/resources/webinars/perl-paradox/