A better paraphrase should probably be "Don't use something new and trendy, because it's new and trendy".
Sometimes you need to use a new feature, but often there is a more legacy friendly solution. I believe that the use of "our" has been complained about before, there are plenty of modules on CPAN that use "our" when they don't need to, and that does cause lot of pain to users of older Perls.
I make no comment about the point at which older versions of Perl are considered too old to be used or supported.
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