Chomsky & Gradualism Here and here [both pdfs] are some easy reading if you're interested in some rather straightforward critiques of the Chomskian paradigm. The long and short of it for me is that Chomsky's approach to language is evolutionary nonsense. Not only does Chomksy and his ilk almost entirely divorce language from function, but so too does he universalize utterly contingent aspects of language while at the same time making those aspects 'innate'. It's a Platonism of language that is, for me, indistinguishable from a theism. No one who takes evolution seriously can take Chomsky seriously.
Edit: A popular article by Vyvyan Evans, a summary of his book on the utter and complete waste of time that is Chomskian linguistics, can be found here, if you'd prefer some lighter reading: https://aeon.co/essays/the-evidence-is-in-there-is-no-language-instinct — StreetlightX
I would suggest reading anything by Chomsky rather than taking the word of these authors. I can't see how anyone remotely familiar with Chomsky believes this nonsense. For example:
"Talk of linguistic universals has given cognitive scientists the impression that languages are all built to a common pattern. In fact, there are vanishingly few universals of language in the direct sense that all languages exhibit them. Instead, diversity can be found at almost every level of linguistic organization. This fundamentally changes the object of enquiry from a cognitive science perspective."
This has nothing to do with UG. Absolutely nothing. Of course there's an enormous range of language diversity.
More:
"A widespread assumption among cognitive scientists, growing out of the generative tradition in linguistics, is that all languages are English-like, but with different sound systems and vocabularies. "
Utter nonsense.
"The claims of Universal Grammar, we will argue, are either empirically false, unfalsifiable, or misleading in that they refer to tendencies rather than strict universals."
If the language capacity is shared by all human beings -- in fact essentially defines human beings as a property -- and no other organism has this capacity, then there is certainly a unique genetic structure underlying it. How this can even be disputed or controversial is mind-boggling.
As far as the Piraha language: here's a good response:
https://muse.jhu.edu/article/362672