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> I always interpret "idiomatic" as "avoiding performance issues".

Huh? That is definitely not what it means. That may be a byproduct if the language implementers then make the social mores they admire the ones that perform the best, but otherwise that's not what makes something an idiom or a social more.

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> That may be a byproduct if the language implementers then make the social mores they admire the ones that perform the best

I understand the definition of the word idiom. I'm saying that the quoted scenario is, in fact, not just hypothetical, but likely. Thus, following idiomatic style can help one avoid performance issues.

Not at all likely, and in fact if you believe this without first investigating its validity then you may be bit by bad performance. A very real scenario is that you use something blindly because everyone else does, thinking it performs well, and then you find out it actually doesn't.

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