Nothing, i'm just curious [1] about Julia. I never used it.
[1]It's just because i find the science python stack a bit absurd.
Right now, using is as a “quick” command line utility for solving small problems is probably not a good Julia work flow (unless the overhead you mention doesn’t matter to your application). Where it shines is for longer-running or repeated computations where the initial compilation cost of starting a new REPL doesn’t matter.