"What use is <symbols> for anyone except someone who already groks what the S combinator does and is for?" How does this not apply to any and all identifiers a

"What use is <symbols> for anyone except someone who already groks what the S combinator does and is for?" How does this not apply to any and all identifiers and symbols and functions? What use is a given function until you read its signature, implementation, and docstring? You could use this to condemn all abstraction. After all, even a function you take for granted comes at the expense of indirection. It just so happens that we as craftsmen make trade-offs. Imagine a pattern that shows up so much that you can extract it into a function like a combinator. For instance, look at parser combinators. Yes, you'd have to credentialize in some patterns, but once again, that's what we do every day as we work on what amount to machinas of abstraction.