Write-only perhaps, but with perl you only have to write it once and it'll run forever, anywhere. No breaking on updates, no containers, no special version of Perl just for $application, just the system perl.

Because of this, in practice, the amount of system administration mantainence and care needed for perl programs is far, far less than other languages like python where you actually do have to go in and re-write it all the time due to dep hell and rapid changes/improvements to the language. For corporate application use cases these re-writes are happening anyway all the time so it doesn't matter. But for system administration it's a significant difference.