I just was answering the case for the advantage of Clojure over Julia as a general purpose language. And pervasive immutability is an advantage in that case. I agree Julia needs mutable arrays, I think for the domain it is targeting mutable arrays are a must but that should not mean that it needs big old imperative loops absolutely everywhere either.
Imperative and mutable isn't inherently wrong, even in a general purpose language like Julia.
In Clojure it's hard to write imperative code, which was one of the reasons I've left. Sometimes, imperative programming is the best way to code something. Sometimes it's best to do it in a functional way. Julia can do both.
The same is true for mutability. I understand the advantages of immutability but I think it's overhyped. Besides the obvious advantage of mutability - performance - it sometimes makes for more readable and shorter code. And what if you have some complex nested state and need to change a small part of it?
BTW - what do you mean by functional programming exactly, how does it differ from imperative programming in your view?