I mean that your statement implies that people are advising to perform expensive work without considering the cost, specifically the cost in terms of time, and

I mean that your statement implies that people are advising to perform expensive work without considering the cost, specifically the cost in terms of time, and that's not true. No one has said that. The article addresses cost in a number of places - maybe not explicitly the cost of time, but it seems weird to focus on that. The article explicitly addresses that it's not so simple to just rewrite a codebase: > Moving a large codebase to a new programming language is extremely difficult. If people want to convert QEMU to Rust that would be great, but I personally don't have the appetite to do it because I think the integration will be messy, result in a lot of duplication, and there is too much un(der)maintained code that is hard to convert.