Why isn't Julia written in julia?

I have seen many other languages, like Rust or Go. I’m no expert, far from that. But, wouldn’t it be useful if it could be optimized for its use case, to work as efficiently as possible. What am I missing?
Thank you!

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The specific name for X written in X is “self-hosting”

This thread from 2013 has the reasoning

https://julia-dev.narkive.com/I7dN7PyT/any-plans-to-get-julia-to-be-fully-self-hosting

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