When is metaprogramming the best solution?

New to Julia
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Julia has all these fancy metaprogramming features but when is it actually most optimal or comfortable to use them?
Follow up question: Is it ever worth it use metaprogramming in a complicated way?

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6 Likes
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I am a user of macros, but have never written any. @chain and @benchmark are my most common encounters with metaprogramming. @turbo and @tullio are other good examples.