I was looking at the swimmer in the first video. Serviceable technique. I think there are some important things lost in the dry land demonstration (and I’m willing to cut people a little slack on that–it’s difficult to simulate aquatic movement on land, one of the big weaknesses I see in the swim bench machines like Vasa and Halo.) I have filmed and coached easily 1000+ triathletes through clinics, private lessons, masters. Trust me, a very very small percentage of triathletes look anywhere near that skill level. It’s not perfect and my intent here is not to analyze this particular swimmer. But the core underlying mechanics are pretty sound for effective swimming. People are welcome to their opinion about whether they would want that stroke in the open water. If you had a triathlon club with 100 athletes from novice to elite I suspect a small percentage would look as good. Less than 20 percent.