Since what we're doing is a martial art, our kamae, movement, and techniques only have real meaning in the context of a relationship with another human being. Therefore -- and this is my opinion, which is worth exactly what you're paying me for it
-- tactics need to be taught from the beginning, at the kihon level, along with the techniques. I don't feel it should be a case of, "Here's how you do omote gyaku. Work on it diligently for a few months and get good at it, and maybe then I'll show you some ways to apply it that won't get you punched in the face by the guy's other hand when you try to do it".
I feel that tactics should "drive" or determine techniques, not vice versa. If your tactics are sound, you may still be able to survive if a given technique gets screwed up. Conversely, you can have the best, most perfect form and technique in the world and get killed because you have no tactical sense.
I saw a video clip some time back of a young Iraqi insurgent with a rocket propelled grenade launcher preparing to fire on some American troops. He got into a good, stable kneeling position, great kamae. He held the weapon properly, aimed properly, and was riddled with bullets before he could fire.
Obviously someone had taught him the proper mechanics, the technique, of using the weapon. But apparently his teacher neglected to tell him that the
tactic of setting up to use it in the middle of an otherwise-empty street, in full view of the people he wanted to kill, was sub-optimal.
With proper tactics, such as a concealed approach and firing from cover, he might have survived even if his technique failed (e.g., if the round was a "dud" or he missed his target).