Much of our "duct tape" is unmaintainable code with undocumented aracne regexes everywhere, single-letter variables, and 1990s-era flow control. Nothing you'd find in Modern Perl is in our duct tape. Ultimately, the fastest turnaround on "we need feature X added to Perl script Y" is going to be "rewrite Y in Python, add feature X" because actually extending the Perl code has proven to be a nightmare.

(and as a side note, most of these Perl scripts ran out of cron on various boxen scattered across our network, and as I've been rewriting them I've also been removing them from cron and putting them in our centralized setup that uses Jenkins to run scripts, pulled out of git, inside Docker images on a schedule)