Well, this is kinda interesting that I saw this thread today, because I was riding a girl at the barns reining horse (the best little pony EVER! Lol she is an amazing reiner, but she got injured, so I ride her sometimes along with other people to get her back in shape) and I decided to ride her bridless/bareback, She was perfect, turned sharply, heck, I could even spin on her like that! She was PERFECT. But I don't have a bond with her, she is jsut a well trained horse, But my horse (rena) can go bareback and bridless, and I have a great bond with her. She's the best horse I've ever ridden,we just click. But she doesnt do bridless nearly as well.
So I think its good training mostly. But a bond helps a lot too.
If there are no horses in heaven... im not going.