I think the consensus response from the Julia community is that the author is spot-on with a key point: that Rust is exceptional when you need/want static analysis. And Julia isn't great there.
This doesn't mean, however, that Julia doesn't solve the 2-language problem. There are large classes of problems and applications — especially in scientific computing — where a complete static analysis isn't required to move into production. It is definitely helpful for maintenance and security (and a requirement in some industries), and Julia's static analysis tooling is continuing to improve... especially with ongoing investments from key companies pushing us towards this goal.
Rust is a great language when you know exactly what you want to write. When you know exactly what the inputs are and what the outputs are and what the algorithm is. And it's really painful when you're not sure. Pick the right tool for the right job!
