So 6w... how old are these colts you are backing? Weanlings? Yearlings? Considering that is around the age most people geld telling them to back their horse at that same time is asinine and dangerous to the horse in question...
You're kidding, right? Weanlings, yearlings? LOL! You are saying what I did is asinine and dangerous? How many colts do you start a year? I've started 4-3 yr olds since spring, and none have offered to buck, nor have they been harmed in any way. I would never back anything that wasn't at least a 2 yr old, although the colt I referred to was closer to 3.
We don't start our colts until they are 3, which is one reason our horses stay sound, and last a long time for us, and those that buy horses from us. Backing one and walking/lightly trotting for a few minutes around the round pen is not the same as breaking one to ride. However, that said, that tiny bit of work sticks in their head, so that when I do start them on down the road, much headway has already been made. And, what I speak of it not dangerous at all.
I realize not every one is equipped to run a stud colt until they are 2-3 yrs old. We are, and have 4 stud colts on pasture on the other side of the ranch from mares.
Between my husband and I, we have good bit of experience, and I do know what I'm talking about in regards to knowing what age to start one successfully, and how much/how little pressure they can take. I wouldn't start a warmblood until they were closer to 4, as they mature slower mentally and physically. We don't put much pressure on colts unlike many show horse people. Everyone does things differently, and I've seen the mistakes and results of horses starting too early. It's one of the reasons I'm not a fan of reining, or some of the other disciplines that start horses way too early.
I'd be willing to bet we geld many more colts than the average horse person.