Narcissa, you seem to be ignoring everything aside from the language of the original post. Let me see if I can clarify:
Emailing a new cacher, making a claim that some behavior (in this case, short logs) that is allowed by the site is in fact restricted, I would agree is not a good thing to do. Judging by the word "taboo", the original poster made have made his case too strongly.
On the other hand, what I and several others have said about friendly welcomes, with the info that some cachers prefer longer log messages, as it helps them make better caches, I think is perfectly acceptable, and I would have welcomed that kind of message.
So to your point, lying to a new cacher? I agree, bad stuff. Offering a friendly welcome and an opinion? Perfectly ok in my book.
As always, just my opinion.