Author of post here: there were a major gripe for me starting out too. It took me a fair while to conclude that they allowed to useful things in the bigger picture. and it certainly is not a pure win.

I do miss static typing.

I would question the claim it doesn't scale to production. I know people who have build hugely complex production systems in perl that are still running today 20 years later.

Further, I myself work on what we believe to be the largest closed source julia code base, in terms of number of contributors, number of packages and total size. (Its also pretty large in general, though i have yet to work out how it stacks up against DiffEq-verse). And I have seen thing go from research prototype into running in production. It works.

I am not going to deny though there are advantages to other languages. There are many trade-offs in the world