So at last there is a scientific research study that valides claims regarding the compression of the throatlatch results in airway interference.
This clearly means that the misuse of equipment causing the horse to overbend at the throatlatch is 'abuse' of the horse.
What is USEF, AQHA and other American equine associations going to do now to protect the horses?
What is FEI going to do now to protect the horses?
But the bigger question is just how many riders, trainers and judges are going to complain on behalf of the horses?