In my opinion, if you can't jump or do cross country, or any given horse activity, in a regular snaffle, such as an O-ring or a D-ring, then you are just managing a prey animal and the horse is not well prepared mentally and emotionally. I'm not saying curb bits, for instance are bad, they have a time and a place, but ya'll know what I'm saying.
I think any twisted bit, gag bits, shanked snaffles, chain bits, and lots of others are just used for control and brakes and they are torture devices. They are "good excuses" for bad hands and not enough knowledge. Just my 2 cents.