To my aunt and myself, that's not right. So we wait until their balls have dropped. If they don't drop, then yes we will have to get the vets to do it the other way. And my aunt, uncle, cousin, and I have experience working with stallions. They trained our 7 year old paint gelding when he was a stallion (he was one for 3 years before the cut him). They've also trained someone else's stallion because they couldn't do anything with him.
A horse doesn't care how much you know until he knows how much you care.