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Isn't an ORM the perfect example of something that is not language agnostic?

The implementation is, but the concept is transferable. Pretty much the same for most concepts in programming.

SQL is far more useful to learn than any one ORM or even the general concept of am ORM.

ORMs are language-specific, but the insight to avoid ORMs for the rest of your life because of impedance mismatch is general and deep.