I jumped forms because this has changed from a discussion about the specific technique, to the meta discussion of techniques in forms in general. It made that jump when
@Dirty Dog decided to make it about me and my opinion on blocks, instead of addressing this technique. And also since my issue with the technique was addressed by
@paitingman by pointing out that my stance was wrong.
And this, to me, is why I am so detailed in my analysis of each technique as it is. Because something wasn't right, and rather than wave it off as something else, I figured out why I was wrong.
Now, I have to ask: where is the line between a different motion and the same motion. You admit that it's a different motion in the quoted post. "Just usually rotating the forearm to use the open hand to soften the block." That's a different motion. You have to qualify "it's the same motion,
but..." (Not exactly your words, but I'm paraphrasing here). So you admit it's different.
The two closest techniques I can think of, even closer than knifehand blocks and strikes, is an outside block and a backfist to the nose. Even these are slightly different, as with the outside block the tension is outward, with the backfist the tension is forward. The difference is that the outside block will go straight out from my chamber position, but the backfist will cross my body closer to my chest and then go out. Even though they look similar, they are still slightly different. Knowing this lets me practice the techniques for their different application.
This "it's the same motion", to me, attempts to absolve the need to identify these differences.