There's a real effect here; I remember Henry talking about it. Suppose you've got two polygenic traits under selection, say, intelligence and disease resistance. The selection pulls the population in two different directions.
So there was selective pressure for boat building skill that was novel, selective pressure for iron smelting and forging skill that was novel, selective pressure for wool weaving that was novel. All of those things are done better by more intelligent people.
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Oh right, let's jump to Thalassophilia.https://www.nytimes.com/1985/06/09/books/the-bad-seed-of-bad-science.html …
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the invention of language *reduced* the selective pressure for intelligence - sure.