Julia is intended to be (and already is) a general purpose programming language. What it does not try to be is a language that tries to be good for every purpose. Python for example is a general purpose programming language but you wouldn't use it to write kernel modules, and likewise you wouldn't use C to write your simple website (even though you obviously can). A language that tries to be everything to everyone will either be too bloated and complex, or lack the included batteries for pretty much anything.

Even if we don't use technicalities, Julia is a very powerful language that allows people to extend it for purposes it was not built for. If it didn't support JSON, you could write a JSON type as integrated and fast as what the stdlib offers, it's metaprogramming/multiple dispatch paradigm allows for easily creating frameworks for many purposes and while numerical processing gets special attention the language will still outperform in terms of speed most dynamic languages in any domain.

And I do think short scripts are within Julia's main targets and are merely victims of the fact that the language is still too young and the battles the devs chose to fight within that limited time (and either AoT options or an interpreter that runs code while it's compiling could solve it really well for example, but both would require a lot of time and work which could be used for other features).