I think outside of highly formalized writing (usually found exclusively in academia) grammar only matters to the extent that it doesn’t interfere with the voice of the author.
It matters because it makes things easier to read. A wall of text with no punctuation or capitalization is difficult to parse, both for the reader and for the writer if they need to go back and make changes.
On the other hand, punctuation can be used incorrectly to convey things that might be part of how the author speaks. Examples being: using ellipsis to indicate trailing off at the end of a sentence, perhaps because you’re still trying to find words to finish the thought, or using parentheses to indicate a slight tangent or clarifying statement, or failing to use a period at the end of a text message to indicate a softer tone and an openness to a response.
Capitalization and misspellings can be used similarly. Such as intentionally misspelling a word to indicate that it should be pronounced differently than usual, or capitalizing all or part of a word to add emphasis.
TLDR: Proper grammar matters for clearly conveying information, but intentionally breaking grammatical rules is a good way to add your voice, personality, and tone into your writing. And that is more important than being technically correct.
I think outside of highly formalized writing (usually found exclusively in academia) grammar only matters to the extent that it doesn’t interfere with the voice of the author.
It matters because it makes things easier to read. A wall of text with no punctuation or capitalization is difficult to parse, both for the reader and for the writer if they need to go back and make changes.
On the other hand, punctuation can be used incorrectly to convey things that might be part of how the author speaks. Examples being: using ellipsis to indicate trailing off at the end of a sentence, perhaps because you’re still trying to find words to finish the thought, or using parentheses to indicate a slight tangent or clarifying statement, or failing to use a period at the end of a text message to indicate a softer tone and an openness to a response.
Capitalization and misspellings can be used similarly. Such as intentionally misspelling a word to indicate that it should be pronounced differently than usual, or capitalizing all or part of a word to add emphasis.
TLDR: Proper grammar matters for clearly conveying information, but intentionally breaking grammatical rules is a good way to add your voice, personality, and tone into your writing. And that is more important than being technically correct.