It's really interesting to see that Julia has no null, even though it's dynamically typed. I've not seen that combination before.
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I really like the MELPA model of packaging directly from git. It solves the problem of forgetting to release something -- just merge a PR and you're done.
It also makes version number bumps much less important.
You could go even further in a statically typed language and also figure out when breaking changes occur.
I've heard of 'blub languages', where you don't realise that other languages have better abstractions until you've experienced them.
I think the same thing happens with individual features. I've seen several C++ folks miss variadic generics in Rust, but I've not written enough C++ to feel it.
I've seen "cons cells" and "cons pairs", but today I saw "conses", which is new to me.
(Clearly Lisp has no downsides, only pros and cons! 🙃)