> You don't close your comments with "I'm not your DBA" or "please consult your own paid certified C++ developer" or whatever

I (and others) actually do do that when it seems relevant, eg [0] (and it's parent which does similar[1]).

0: https://news.ycombinator.com/item?id=27658362

1: https://news.ycombinator.com/item?id=27658258