Well I would like to say I'm no novice and painted black in that case doesn't show me collection. And also not just anky isabel werth and many others train like it. As I also stated before MOST of all horses show over collection in upper level dressage not just anky. Go to any arab horse show you would find most all of the horses have there heads in correct position. (And yes if it is in saddleseat or country pleasure its head is high) therefore you can judge the breeds head position if I see most upper level horses heads are held wrong I can draw a conclusion that there is to much being asked if you to that making your horse carry its head like that. Maybe its just me but for an arab to be able to do I must say every other discipline of horse riding I don't see how it is so unfit for dressage because warmbloods are a mix of arab or thoroughbred and a cold blood draft so something must be seen in them to be breed to create an excellent dressage horse.
I don't think you understand what I'm saying. YES other breeds can do dressage, YES other breeds can compete at Grand Prix... BUT when you look at numbers of horses in the top of any discpline, the ones that are bred for that discipline make up the highest percentage by a long shot. Not just dressage, ANY discipline.
And no, a warmblood is not a mix of arab/TB and a cold blood. There have been many discussions about that - today's European WB registries, such as a Hanoverian, have been built on centuries upon centuries of selective breeding to create a specific 'type'. Sometimes we infuse a little arab or tb blood in there for refinement, but overall, the type is pure.