I spent many years on a copy desk, many of them as copy desk chief. Discussions of finer (often trivial) points of grammar. These were mostly unproductive wastes of time, IMO – but some people just can’t accept that English grammar does not yield to logical examinations. Often the only possible answer is that of all Mommies – “Because that‘s the way it is.” I got really fed up with petty quibbling.
So when I retired, I made one resolution. I will never be drawn into any discussion of the Oxford comma.