I'm with you on that Eboy. my complaints avoid mentioning date and sector so that they cannot 'pin' things on to the crew (flight and cabin).
I recently wrote to an airline (UK) that I have used many times this year to compliment a particular crew and I named the people that had been good. I only posted last week, so I have not yet had an acknowledgement form the line. It will be interesting to see if I do!