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>functions as first class with underlying lambda calculus semantics (as opposed to lisp)

Do you mind elaborating on this? How does lambda calculus underlie JS/TS functions but not functions in LISP?

The main issue is that LISP supports dynamic scoping, whereas lambdas act like lexically scoped functions.

Supports, but it's no longer the default for local variables. since 70s in Scheme and 80s in LISP.