I think Sample code has its value. It helps you learn stuff rather quickly. Just because some people push sample code to production does not justify not providing/ using sample code in the first place.
But to agree with you, thanks for spotting the perils of sample code. I guess it can be used as a gentle reminder to every one using sample code...
Yeah, I understand that tutorials are usually written with the focus on one thing but pointing people to even a link for security or unit testing techniques would be helpful.