> “ If your heavyweight runtime is being launched 1000s of times to get a job done every day or multiple times a day, consider optimizing. Which may include changing the language. That's hardly controversial”

No, that is controversial because the time saved per run (even 1000s of times per run with multiple daily runs) is never going to come close to amortizing the upfront sunk cost of that migration and future maintenance.

I’m specifically saying in the exact case you highlighted, people will short-sightedly think it’s a clear case to migrate out of the easy-but-slow interpreted language or never start with it to begin with, and they would be quantitatively wrong, missing the forest for the trees.