Your Functional Programs Are Imperative Pumpkins
Yurii Rashkovskii

Interesting article and two things struck me immediately, you can still have mature tooling and ecosystem with FP (look at Scala and to a greater extent Clojure on the JVM and JS platforms).

Secondly, there are immutable databases, such as Datomic, that go some way to addressing the issue you raise about an impedance mismatch between FP and data store.

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