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But that would be a language with completely different semantics.

CL still tries to preserve something from lambda calculus.

No, why? Earlier Lisps had locatives while preserving their semantics, and https://github.com/stylewarning/cl-locatives emulates this behavior (albeit with a slight performance hit).

What in Lisp exactly is similar to lambda calculus, though? Lisp isn't even a pure language.

And lambda calculus isn't even a programming language. The argument was like saying "C still tries to preserve something from Touring machine".

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