Mm, I don't agree with the way she and Sjef have handled this. She has no defense anyway, she has long been linked to rollkur, and if she hasn't realized that yet she's crazy.
That being said, I don't mind rollkur as a stretching exercise. But I am very much against using it for your entire ride, or even for several minutes at a time. Long term damage has been proven, and it's clearly uncomfortable for the horse, and it's just wrong to work them like that.
I don't practice it, because frankly...I don't need to. Jack and I have other stretches that work just as well. And honestly, I'd be hesitant to use it as a stretch at a show. Someone would likely see it and judge the situation before they had the real facts and get a very wrong impression of me.
Cinnamon Whiskey 11 y/o 15hh Chestnut AQHA mare, 2'6 Jumpers