of course, nothing comes with everything. (yes, R does come with rootfinders, parallelism, and optimizers in the box.) fortunately, there is one julia, and not ten dialects of julia with newbies having to figure out which one to choose.
it is a matter of where to draw the line.
I just want julia to be a generally viable alternative in finance, economics, and statistics classes, where the students spend their 10 weeks learning julia, rather than 10 weeks researching package ecosystems for minimum functionality. maybe julia does not want to go there. this would be a pity.