Pruning Scar Experiment Update ― Which Technique is Best?

I watched a video like five years ago (maybe six) where the expert pruner insisted that when you prune a branch, to cut along the collar line and leave the collar. This was supposed to help with healing if I remember right. I knew from experience that this did not make sense, so I have been doing experiments since then, and the results are in.
Corona Tools 13-Inch RazorTOOTH Pruning Saw - amzn.to/3WtLDGv
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