I've now had a little delve around the internet. Interesting.
One thing that someone mentioned was that he goes on and on about "taking the violence out of horse training" - which implies that violence is the norm.
Also he goes on and on about how few horses started "his" way buck. Well, I used to work on a "breaking" yard and I sat on dozens of horses for the first time, moving on to their first hacks and gentle schooling, and I don't actually remember any of them bucking either. Sure, some horses DO buck later on, often when you start working them "proper" and they're on harder feed, and they're fresh etc.... but bucking as a response to being backed? Nope. Hardly ever happens, if they're broken properly.
We used to make a huge deal of going at the horse's pace. One person holding the horse, petting and feeding it, the other person hopping next to it, slapping the saddle, pulling on the stirrups etc... progressing to putting a foot in the stirrup and hopping some more, leaning over the saddle and so on. Always keeping the horse happy with sweet talk and food. The person holding the horse in fact has to be more experienced than the person doing the mounting; you have to have an "eye for an eye" - be able to tell if a horse is calm and relaxed, or if he's starting to worry a bit. The horse's eye tells all.
We broke several horses that had been written off as unbreakable, with no gimmicks or magic tricks. Just patience and counter-conditioning.
Traditional doesn't necessarily mean brutal - and Monty tends to imply that it does.