- Edited
Maybe this post can bring together both Sidokar's and ShiroKuro's ideas
On conclusions: There was the "scientific" observation of I think a phys ed. prof. and snowboarding. S/he was trying to perfect snowboarding by focusing on feet and the board; and only succeeded after shifting focus on destination. The CONCLUSION presented was that to succeed, we should not focus on how to use our body or on the instrument, but only on the sound we want to produce. This became advice in one of the videos. So:
In my experience, strings players are usually taught heavily to focus on the body and the instrument, so they may have too much of that. In this case, switching your focus on the desired sound may counterbalance this. In my case I had almost no training on instrument/body; I was sound-oriented in the proposed ideal way. Without the body and instrument awareness, I did awkward things that produced the desired sound but was not sustainable. For someone like me, the counterbalance is to focus on body and instrument. When I responded in the YT video, MG agreed with my conclusions.
The thing is that anyone trying to learn from that video would see that THE way to progress is to switch to focusing on the desired sound, because that was the CONCLUSION presented. I could only give the counter-argument because of my experience. Hopefully it might help someone else if they read that exchange.
Yes - there is experimenting. But your experimentation will also tend to base itself on underlying premises. You'll tend not to try this or that if it's contrary to the premises presented by someone with the title of expert, and where the ideas are labeled scientific. If you can forego bot the title and the label, and be as skeptical until proven as if it was given by the mailman down the street who happens to play piano or viola, maybe that's a good way to go.
I went down these routes a few decades ago. I even pretended I was a kangaroo (cf Havas).