I have thought about just why such things as comma splices committed by writers who expect to be paid for their writing irk me so. It all comes down to their sheer laziness and lack of respect for their readers. They appear to be either too lazy to either use a semi-colon or a conjunction (or, in many cases the better option, a simple period followed by a new sentence), or they are and have been too lazy to learn rather simple standards of orthography. Either way, it shows a lack of respect for any reader with at least a fifth grade reading level. *shrugs* Is it too much to expect someone who wants to be paid for his work to take the trouble to do it right?
And yeh, this holds for the lazy, disrespectful habits of some wannabe writers (and, admittedly, some well-established writers *sigh*) who have never bothered to become literate enough to know they are misusing words/terms, committing asinine grammar errors, irredeemably stupid failures to do their research on facts (or the math on their “research” or whatever), and all sorts of other completely unnecessary stupidities that distract from whatever they are attempting to convey, whether that is a research paper, a “news” story, an opinion piece, or a novel. If they want to be paid for their work, they should actually do the work.
Sterling #gagamaggot example from. . . just now: a writer with a character whose first person narrative presents him as exceptionally literate, former English teacher, Deep Thinker, always spouting “erudite” quotations, etc. CONSTANTLY committing egregious grammar errors, misusing words, and more. Kills suspension of disbelief.