To OP, yes, Path of The Horse is interesting & agree pretty much with others here. I too think I like Carolyn Resnick's approach best of this mob, but there is a lot of good stuff in all of it... including AN's stuff, which I agree is a bit too fanatical IMO. His website has some very inspiring stuff tho!
I watched part of the video. It is factually bunk. Saddles cause pain? Horses often carry riders for 12+ hours without 'going numb'. Bit are not causing hundreds of PSI of pressure in the mouth. Riding strengthens the back. It doesn't harm them.
Like I said, think he's a fanatic & agree that it's too.... far left of centre, but have to comment on the above - I think *the way you put it*, your statements are 'factually bunk' too. Saddles very often do cause pain and if constant, unremitting pressure is applied to live tissue, even by a well fitting saddle, it can indeed cause numbness. Bits can indeed cause a LOT(don't know how many PSI, don't care) of pressure/pain/damage acutely, on sensitive bars, who's tissue is also incapable of callusing(there is no such thing as a 'hard mouth', literally speaking). Riding can indeed do great damage to a horse's back, even if bareback or in a well fitting saddle. It doesn't strengthen the back, but it is exercise that is done, usually with a rider on board, that strengthens the back. Do I think all of that is necessarily damaging & so therefore wrong? Not in the least, or I wouldn't ride or ever consider using a bit, but injury from riding(mental too) is very common & absolutely worth considering.
The other thing about AN is the way he keeps his horses. *Apparently*(I have heard) they spend a lot of time stabled & are kept separated, in order that they're more willing to come play with their human. I believe if that is true, it is very wrong on a number of levels and also hypocritical to his supposed ideals.