Steve
Mostly Harmless
Depends on the point at hand. I think that if you are distinguishing between "too destructive" and "too deadly" you are caught up in a red herring. If it's too dangerous to apply, it's too dangerous to train effectively.Not meaningless, at all. I teach almost nothing that is designed to kill (a few things I was taught, which I will cover eventually, but aren't part of my normal curriculum). Many of the things I teach can be used for destruction (like the small-bone bind I mentioned earlier). It's not even remotely untrainable. I've seen it executed at speed in response to an attack with intent. That only works, however, if the partner ("attacker") is willing to acknowledge the danger and drop out of the technique and tap, rather than fighting against it. There's a less destructive move that works a bit further up the wrist, and this can be used on a resisting opponent, but must be abandoned if it slips lower. We often use that one for training with speed, as the movement is nearly identical. And when we train the exact movement of the destruction in drills, we just slow it down to expand the time the pain exists, so there's time to tap out. Putting those two parts together allows us to train the full range of the technique (slow) and the motions at speed (the alternative further up the wrist).
Training a technique doesn't require exact replication every time. If it did, shadow boxing would be a useless exercise.
Regarding the rest, I've shared lengthy posts many times explaining why some martial arts are better at developing skill and expertise than others. I don't have the patience to start over as though this is a new topic again.