EEEEEK! To hack???!!
I would think that'd be dangeroussss! You don't have much control with those, and if your horse were to spook, rear, buck, etc. you'd be up a creek. Plus, if you snatched up her face with those after a spook I'd think she'd panic and things could escalate :/
I don't like the things at all, but I think if you have to use them, use them sparingly and to only refine things.
Oh, and a con of draw reins is stiffness IME. I know a few people (OK, a lot of people in the arab curciut around here) that use them and they have no lateral flexion from their horse.
Every great dream begins with a dreamer. Always remember, you have within you the strength, the patience, and the passion to reach for the stars to change the world. ~Harriet Tubman