I think it depends on the horse. If you can lunge and ground drive just in a halter you MIGHT be able to go bit less.
I was gonna teach my dwarf to drive and go bit less with him. He was about 28 inches tall with a severe underbite. I would not have ever driven him off property though, too much risk involved.
My biggie, 1200 pounds, I can lunge and ground drive in a halter but I would never ride him bit less. He is a VERY well trained horse, 24yo, but at times, when his mood permits he can be a bully. Too much risk involved…. Either that or im too much of a chicken.
Breezy, only 200 pounds, I can’t even lunge nor ground drive in a halter, he has to have a bridle & bit. He is young and has waaaay too much energy. Grass skiing is a real thing with some horses
I could probably drive bit less with my Stormy, but we do a lot of trail driving in a lot of different places. I prefer a bit, but I’m also a big ole chicken
the older you get, the harder the ground is
A few people even have bridleless driving horses
I wonder how you steer a bridleless driving horse?? Maybe they just drive bridleless in the same spot over and over? That just seems like too much risk involved for me, especially trail driving and I am up for some pretty challenging things. A bit isn’t a bad thing if in the right hands. Yes, any bit could be harsh, just like any whip, but if used properly it is simply an aide in communication.