The good stallions I have had also lived in herd dynamics from foaling onward. We as humans tend to get so focused on teaching horses what we want them to know that we drown out what other horses should teach them. No human can teach a young, hormonal adolescent "good manners" like a no nonsense lead mare! This is the whole concept behind natural horsemanship - using the animal's own natural behaviors to train it. But if those behaviors are stunted or destroyed because the animal never really gets to be a horse, that can't happen. Consequently, stallions that are sequestered at an early age lack some of the tools that would not only help them be better herd members, but also make them amenable to training. I'm not saying every stallion is an angel ... far from it ... but neither is every stallion a fire breathing dragon. I do agree that beginners should not be solely in charge of a stallion ... it sets both the owner and the animal up for failure and disappointment. And I truly believe most males should be gelded. There simply aren't that many whose potential contribution to the species is good enough to warrant breeding, and gelded males stand a far better chance of rehoming should the need arise. That said, blanket condemnation of stallions as poor working horse candidates is unwarranted also. One of the best hitch horses I've ever known was an intact Standardbred stallion. You could hitch him next to green partner and he would calmly, patiently teach the youngster the ropes, whether that youngster were a filly or a colt. He was just a solid, good minded, reliable horse. And he was just as patient under saddle. I never hesitated to take him on a trail ride because I knew he would be one of the best behaved mounts there. A mare in heat might get an ear perked her way and a call out, but he never broke training in a "breeding frenzy." It just wasn't his nature.