To be more specific - the notion that it's a courtesy is mistaken. It's considered rude at best, and the general public may (rightly) interpret a well-actually

To be more specific - the notion that it's a courtesy is mistaken. It's considered rude at best, and the general public may (rightly) interpret a well-actually as a mark of low social or emotional intelligence. So, we must carefully consider what really signals intelligence. Linguistic errors pale in comparison to errors of understanding like missing the point.