> Exactly. No one is saying "rewrite it in Rust because it already works". They typically say it because the thing in question is a bug farm, or it's really difficult to maintain.

Well some people are. Is there a word for attacking the weakest real version of an opposing argument? Strawman usually implies you are attacking a fake version of the argument, but on the internet you can usually find someone who actually holds an easily refuted point of view, just because of the law of large numbers...