If someone were to make up their own spelling and grammar, as in your example, then their audience would not understand what they were intending to communicate.
A failure to communicate with your intended audience is most certainly a failure, regardless of whether or not they used accepted spellings/grammar.
However, what I tried to explain, and apologies for not getting the point across to you the first time, is that if the author succeeds in communicating their intended meaning then they have succeeded.
And if they use contemporary spellings, idioms, grammar, ascii art, memes, CAPITALIZATION, intentionl tpyos, pop-culture references,.... if they manage to use all those fashionable elements and STILL communicate their intended meaning then they are a super language wizard of supreme craftsmanship ( in my eyes ).
To me the ignorant person is the weary bell-curve peak who is still dutifully applying some simplistic ruleset they learnt decades ago at school, before the Internet was even discovered!
=^..^=
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Please accept my apologies, and thank you for pointing out the difference, I spent an hour reading up on both ARC and GC as a result