...I found a book by Wendy Murdock I had forgotten I had. She is a reiner that studied with Sally Swift and she rides and teaches a balanced position. So there ARE reiners that ride according to classical principles...
Classical? Please remember that the 'classical' dressage position isn't all that old. Xenophon was riding bareback, and bareback riders do it that way to keep the center of gravity low and because there is no positive value to putting the feet forward. And Xenophon was also concerned with being able to throw the spear with one hand...
But from the time stirrups were adopted, the majority of people have not ridden at speed with their heels below them. That was for riding in parades, with a well trained mount moving at relatively slow speeds. The same foes for 'collection' - it was meant for parades, not war. The US Cavalry observed that style of riding, and rejected it as unsuitable for combat.
Flat race jockeys, steeplechase jockeys, polo players, campdrafters, reiners, cutters and others use a different position than dressage, and one that is closer to how people have ridden since the stirrup was invented. They don't do it from simplicity, stupidity, lack of refinement, body odor or any other negative trait. They are using what works.
Someone wanting to ride a steeplechase would be silly if they showed up with a western saddle and declared they were going to ride IAW the classic principles of the Texas cowboy!
... I would say she has really good training, maybe even some dressage background from someone...
Maybe she was taught to ride, and how to ride bareback, without dressage? I don't hate dressage, but I hate it when dressage riders acts like they own the Holy Grail of Riding.
... On the other stop he throws his upper body back - very straight and it seems like this would put a lot of pressure on the horse's loins. His legs also move really far forward and appear to brace him between the cantle and the stirrup. As you do not want the horse to hollow his back and brace in the slide I believe the rider should not do it either....
Momentum. The center of gravity is not where it appears in a frozen frame.
"Wimpys Little Step is quite simply a reining phenomenon. During his three-year-old year, this bionic stallion captured the interest of the reining industry when he won both the 2002 AQHA Congress Open Reining Futurity and the 2002 NRHA Open Futurity with Shawn Flarida in the saddle. In doing so, Wimpys Little Step earned over $185,000. He is only the second horse to win both the Congress and NRHA Open Futurities.Now, just six short years later, the 9-year-old stallion is the NRHA’s newest and youngest Million Dollar Sire." Welcome to Green Valley Ranch! | The Stallions | Wimpy's LIttle Step
"In a sport that is quickly taking the center stage spotlight around the world, Shawn Flarida is the sport’s superstar. He is the NRHA’s all-time leading money earner, and the first-ever Four Million Dollar Rider. Shawn has five NRHA Open Futurity championships to his name, and has won the All-American Quarter Horse Congress nine times...In 2002, he added a big chunk of change to his record when he captured the prestigious NRHA Open Futurity title – his first – on Wimpys Little Step, owned by Mark Schols. The $175,000 paycheck for the win brought him inches away from becoming an NRHA Million Dollar Rider, and in 2003, he became the third rider to earn that distinction, following NRHA Hall of Fame members Bill Horn and Tim McQuay." About Shawn Official Shawn Flarida Website
Reining isn't dressage, nor does it want to be. Western riding isn't dressage, nor should it be. Dressage is about parades and show. The other disciplines using other approaches are not inferior to dressage, and their riders are not simplistic brutes fumbling about on a horse.