>You 'can' have those things, but 'should' you?

As opposed to what? Wait for Julia to catch up in 10 years?

If so, yes, you absolutely should get those things from where they're already available.

>Why use a "slow" language if you don't have to?

Because that's where the action is, and who gets those niceties first.

Julia hasn't even fixed their slow startup/load situation all these years...