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Codebases were littered with (vec (map ...)) and (reduce (fn [acc [k v]] ...)) patterns which are nothing but noise. This change removes the need for that, makes the intention clearer and in the case of reduce-kv removes the need for lambdas in some cases (where it was used only for destructuring).

I think it's more that everyone previously had the same helper function/macro in their code base with a different name. If everyone needs the exact same thing, the standard library is a better place for it.

They are actually much more efficient because they have type-specific implementations that operate directly on the underlying data structures, rather than constructing intermediate MapEntry objects and then mapping/reducing across those.