This is why "quit rate" is a sign of economic strength. If workers are confident enough that resigning will result in both speedy re-employment and a better job than before, there is probably good overall confidence in the markets.
I think GP's use of "hand-clocking" to refer to the factthat the z80 can run on a very low clock rate, to the extent that you can have a hand switch that sends individual clock pulses to the processor. This can be useful for testing purposes as well as for low power operation in embedded applications.
Parentheses exist because it is the easiest way to represent the raw AST in text form. S-Expressions were originally an intermediate form for a more algol-like syntax[0], but became the primary form of representing Lisp because allowing the programmer to manipulate the AST is extremely useful, arguably what makes Lisp Lisp. There are homoiconic languages like Prolog and Julia that have more familiar syntax styles, but S-Expression Lisps are unmatched in making homiconicity readily apparent.
Another reason Lisp programmers tolerate parentheses hell is that Lisp development has often paralleled that of emacs and emacs-like editors that make manipulating s-expressions extremely intuitive.