It's sensible if you have strict control of your duplications. You do have strict control of what is duplicated and where, right?

Write everything twice quickly becomes write everything 4 times once a new change appears, just as quickly as it becomes write everything 8 times, and so on.

I'm afraid there's no sensible soundbite developers can follow blindly.

Yeah, ~"Write Everything Twice"~ “Copy and Paste Working Code” is a pretty common and sensible direction for any codebase