I've been involved in DC-9/MD-80 training on and off for more years than I'd care to divulge ... there has ALWAYS been part of the training program devoted to tail de-ice problems and procedures. It seems to me that if there is a known problem (that there is a system to prevent the problem or to correct the problem - it shouts that this is a "known" problem) the flight crew members that might be exposed to that problem should be given all the information they need to be able to deal with it should they ever encounter it ... and that should include flight (i.e., simulator) training.