There is a happy medium of force. I've got a horse who was spurred bloody, and I doubt anyone on this forum would try to justify what happened to him. But there are also a LOT of ruined horses who have been ruined by Black Stallion Syndrome: Love your horse and he'll love you and do what you want. On the whole, at least among pleasure riders, I think Black Stallion Syndrome is more dangerous than most spurs.
I enjoyed some of the videos if only because they were so unorthodox, but in life, there often is a reason heresy is considered heresy. In his discussing the sitting trot, for example, he's partially right - bouncing up and down with a stiff spine won't give you a good sitting trot. However, his alternative went in a strange direction. Short stirrups, bent knee, gripping with the knee and stiff back...yep, that will make you bounce. That doesn't mean you need to stick your feet out front and lean back, though. How about trying a long, relaxed leg and a moving back, before trying leaning way back? "...there are only two criteria of your position;
A) are you in fluid balance and rhythm with your horse or not?
B) does your seat enable you to control your horse efficiently?"
- V.S. Littauer
His alternative style of sitting trot may provide rhythm, but the balance is questionable & it didn't look to me like it passed the "does your seat enable you to control your horse efficiently" test! His posting trot advice had the same flaw, as smrobs pointed out. Riding a horse isn't just staying on, but controlling the horse as well.
And some of us - OK, me - learned riding on a spooky mare. She is much better now, although far from perfect, but for general purpose riding I like to add a third test of riding: will you stay on when the horse hits the fan?
I don't own the Black Stallion. She's more of a Night Mare, so to speak. After 4 years, we're building some rapport and understanding, but part of my understanding is that she has some internal demons of fear and trusting me over what she hears from them is hard for her. She tries very hard, but prudence dictates that I ride her on trails with someone else, and that someone else keep the cell phone on them.
I tried imagining me riding her down the trail using his sitting trot technique, but my dream kept ending with me stuck like Wile E. Coyote to the side of a saguaro cactus...