Yes, there's definitely a cost of introducing Rust to an existing project. But there are a ton of projects that could also benefit greatly from it, such that it

Yes, there's definitely a cost of introducing Rust to an existing project. But there are a ton of projects that could also benefit greatly from it, such that it'd be a net benefit even in the short term, and a huge benefit in the long term. I'm not advocating for people to blindly add it to their project.