Julia in particular is built to be a practical language so, these points are valuable.
Julia is a language that is half baked for engineering use. Any one who has ever built anything beyond examples and tutorials, something production worthy and used by hundreds of people - they will attest to how immature Julia is.
That's not the fault of the programming language per se... just that it takes 10+ years to get up to speed in terms of tooling and engineering worthiness.
In addition, there are a lot of problems with the language itself some of which are highlighted in the top comment of this thread.
We love Julia for the same reasons others have stated here: It's easy and intuitive to write, making it productive to work with for both our engineers and our mathematicians. It's reflection abilities make performance tuning and optimization easier than any experience I've had before. The ability to fine tune the assembly emitted for your hotspots _matters_, and it's straightforward to do in Julia. And for the rest of the code, being easy to write, easy to read, and close to the math are all a big win.
I've lived through this.