If a Perl script is written and maintained by just one person, or a few people who can agree with each other, then features like that are not a problem: you jus

If a Perl script is written and maintained by just one person, or a few people who can agree with each other, then features like that are not a problem: you just agree not to use them. They are, however, an argument for not using Perl for a big project that lots of people will work on.