Julia, from when I looked at it years ago was trying like a new version of Matlab or Mathematica. It was very linear-algebra focused, and were trying to replace those packages plus Fortran. They had some gimmicks like an IDE that would render mathematical notion like TeX for your matrices.
Python wasn't the obvious "Fortran killer" scientific language it is today. In fact it's arguably really weird that Python ended up winning that segment. In any case, I think Julia's been struggling since its inception.
Basically a mini/beta/in-progress version of Pycon each week.
Also the VSCode extension has weird performance problems when trying to debug Julia code.
Can you expand on this? Julia's package manager IMO is one of the best parts of the language.
I don't think you'd actually want to include each of those packages in a standard distro: does the average user really need to programmatically send emails or deal with Voronoi tessellations? Probably not, but I still think there's value in a batteries-included approach, especially when working with students.