Whilst I agree that s-expression syntax is not a global optimum, I've dealt with many obtuse syntaxes that are worse.
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So many UIs are fuzzy text completion now. For example: ivy in Emacs, VS Code's command selector and Firefox's address bar.
They scale really well, have good discoverability, and they're forgiving of typos. Is this a local optimum in UI design?
I'm coming round to the view that optimum documentation is one web page per function.
This gives you space for prose, examples, related functions, version history and even user comments!
It's not the norm though, and requires substantial content writing.