Below is the context in TFA, and the quote's form with show/tell placeholders:
she informed one writer that their “story is certainly worth telling,” but they
"[tell] instead of [show], [show] instead of [tell]."
I can read the second part as a directive (I'd use a semi-colon instead of a comma to show this myself). I bet the original letter's connection (instead of "but they" in TFA) supports this.It feeds into my nascent theory that grammar is not necessary for everyday human communication, and its function is ornamental, like patterns on clothing, signifying social position. (Of course, it is useful in precise technical exposition and argument; though there's still greater precision in numerical quantification and first order logic.)
Grammar is the greatest joy in life, don't you find?