I’ve tried bitless riding (with a Dr. Cook bitless bridle) on 3 out of 5 horses I’ve owned and they have all done well. My TB was an energetic hunter who would curl up behind bits and he goes perfectly in the bitless. I wish I could’ve shown in it! Even my feisty Halflinger enjoys it, although if I go x-country I use a bit because she can get too strong. I think whenever you can go bitless, you should, as long as you’re safe and your horse stays listening. Why pull on their sensitive mouths unless it’s really better or necessary?