As others have said, I think it all depends. There's another thread around here discussing the same video and idea. It really boils down to how your hands interface with the gun and trigger. Whatever let's you press the trigger without moving the gun is what you should do. If that means sinking more finger on the trigger, then by all means, do it.
God blessed me with short fingers. I've found ways of doing what I need to do with what I've got.
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