Just so we are clear, I am in no way saying full extension before contact, what had been suggested to me is that you want to attempt to hit the ball as long as possible on the same plane of the pitched ball. Maybe my definition of extension is not the same as yours but when I look at clips of say Cabreras, his hands are closer to his body before POC but when he hits the ball and right after he sure looks as though he has some extension. Maybe it is the degree of extension that we disagree?
Extension depends on a number of variables, including the person's definition of extension. I look at "extension" and "full extension" as two different things. "Full extension" is what people used to refer to as the power v. In my opinion, this does not happen until a few frames after contact. I have heard/read that some people believe this should occur at contact, or as close to contact as possible. You stated clearly that you do not believe in this, so we are at least on the same page there.
I also view "extension" as the distance between the hands and the body. I believe this is used to adjust to pitch location. The gif of Crystl Bustos shows that her hands are more "extended" from her body when working on the outside pitch drill. But she is not at full extension.
One gif that I have been watching repeatedly was that of RDBass in post #12. I have watched this clip at least 100 times and I am still trying to figure out exactly what is going on. But I am not an expert. As best as I can tell, he was fooled on this particular pitch. At least a little. It looks to me like he is out in front of the ball and it appears that contact occurs close to the end of the bat. I believe he is more fully extended at contact on this particular swing than he intends to be, but that is because of being fooled a little. I don't think this particular gif represents one of Cabrera's better POCs.
In summary, I do not believe that full extension at contact is a good thing. I believe this occurs well after contact. But, I do believe that as part of "adjustability", the hands can and should be closer to or further away from the body depending on pitch location.
Edit - If I would have taken the time to read Crankermo's post #11 I could have avoided watching the gif in post #12 100+ times Sorry for repeating something that was already said. On the bright side, I am glad that my conclusion was not in opposition to Crankermo's. Lesson learned on my part...
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