I don't think it's been tested at all. for people who took and finished a course in Lisp as their first programming language, how many "hate parens"?

I have no trouble with lisp's parens, i like them. What I never liked though, is that the first item in the list was an operator, a verb lets say, and the rest were the nouns; whereas, you could also have nested lists say of numbers where there were no operators. Never felt right (not that I can think of a better way, not worth adding more parens)

But good college math departments teach reverse Polish notation; i.e., Hewlett-Packard over Texas Instruments. It’s demonstrably more advanced / efficient.

Lisp became very popular, then died off rapidly due to association with the AI Winter.