They’re inefficient in the sense that they require more time, effort and attention in both training and use: you need to master the transition between double and single action, you need to get used to the manipulation of the decocker each time you finish a string of fire, and if your gun has a combined safety/decocker you need to remember to leave it in whatever position you’ve decided is best for your use (which is a discussion in itself.)
...Put them into an exercise where they can’t predict what’s coming, one where they need to shoot a realistic string of fire at a realistic pace, and the problem almost always shows up (in fact, I can’t remember a case where some transition issue didn’t present itself in an evaluation drill, regardless of the amount of training done up to that point.)
...In this case it’s not the transition itself which is important; it’s the separation of your shots between DA and SA that the transition allows you to make, giving you a good visual of where you’re having issues.
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