Well, that said, things aren't so clear cut. Often, existing scripts limp along with tolerable inadequacies. And maybe they already use unsafe practices, but those transgressions have been overlooked since the scripts work most of the time, and when they don't, it's not too much work to clean up messes and run the script again.
Thanks for your answer though. As I read it, the answer is: you've got to use your judgement and consider how hard it will be to add further enhancements and how unsafe the current script is.
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