The problem when you get professionals talking about EMT, is that the conversation ramps up to advanced techniques. Best practice for an experienced professional isnt the same as best practice for a layman. While the kit itself isn't difficult to use, the hard part is knowing when it's right to use it and that isnt just a question of training, it requires experience too. Whether it's CAT keys, intra-osseous devices or haemostatic agents, they are all simple to use and require little skill to apply, but knowing when to use them requires assessment skills that are far outside the remit of the layman and even trained first aiders. It takes years of exposure to real world scenarios to gain the experience for assessments to become instinctive. You cant teach experience and you cant read experience. You only get it by doing it - a lot. It's the inappropriate use of such things as CAT keys and QC that cause problems. They have their place and are useful tools for the experienced technician, but for the inexperienced and untrained - which means most of the people on this forum, they can be and often are just a liability. We should be advocating simple techniques and basic first aid every time.