As a reader and a writer, why is it important to pay attention to the properties of a well-written text?

350 words, about As a reader and a writer, why is it important to pay
attention to the properties of a well-written text?
if a text has loose ideas, numerous grammatical
errors, poorly constructed sentences, unrelated
paragraphs, and several punctuation errors, what
does it reveal about the writer of the said text? What
impression does it leave you as a reader?