Grammar is mandatory. Following a specific style guide is optional.
I really, really wish more people understood the difference between grammar, which is how a language works, and style, which is how a specific organization or person has decreed that language must be used or else they will become very, very cross with you.
Audience knowledge crucial. one style !fits all.
In a world where every other fact is contended, it's unlikely there will be agreement about that either.
> Audience knowledge crucial. one style !fits all.
And this is the essence of style.
> English flexible very.
Syntax error: verb required.
> Grammar optional.
Syntax error: verb required.
> Convey much thinkings philosophy attitude deliberate dissonance.
Syntax error: clause contains too many nouns.
> Education class wealth signifiers == code switching; academic pretense.
Syntax error: verb required. Punctuation not recognized: "==".
> Audience knowledge crucial.
Syntax error: verb required.
> one style !
Syntax error: verb required. Warning: sentence is uncapitalized. Warning: space exists between last word and final punctuation (french mode not enabled).
> fits all.
Syntax error: subject required. Warning: sentence is uncapitalized.
Verbs are not always required:
"Why?"
"Because."
"Dude!"
"Kinda?"
"Just no."
Contains too many nouns is not a thing. Your compiler should have errored on a mismatch between discrete and continuous quantities (much thinkings should either be many thoughts or much thinking) and then on a compound noun without hyphenation.
Creative punctuation is normal; really, we've only standardized on punctuation since the mid-1700s or so.
Capitalization is, again, stylistic: e.e. cummings, notably, was against it. So was Archie.
And you broke on == and !fits, but the context of reading Hacker News ought to equip your parser with adequate sidechains.