With a Big Lick, soring is always involved, as the mere act of putting those pads/shoes on them makes the muscles extremely sore.
They just hide it better now since the DQP's, and there isn't the open raw bloody areas that used to be on pasterns like in the 50's.
They also quit using their legs as aids somewhere around that time, instead relying on pulling so hard on the mouth with the reins, that you could pull a freight cart with the hands. Pressure is enormous.
These horses, are one of the most stoic of light horse breeds, I've never seen a horse take so much abuse and keep trying, and going. My father called them the "poor man's show horse" because you didn't have to know how to ride, or use a trainer, and the horse would take so much abuse.
If you will search for some of the video of Midnight Sun that is floating around, you can see the old time action, without chains I might add, on the horse in the ring.
This breed deserves better.
Horses make me a better person.