If you are fire-fighting production issues at scale all the time with the original version, you may find yourself out-of-capacity for a refactoring/rewrite. Aft

If you are fire-fighting production issues at scale all the time with the original version, you may find yourself out-of-capacity for a refactoring/rewrite. After experiencing this terrible state of affairs, I prefer getting performance and robustness (mostly) right the first time.