Unlike a thoroughbred or qh, most Arabians tend to have a very high head naturally, and as soon as they are alert, excited, upset, etc, their head goes sky high. This is my mare, who I do endurance with (not in endurance shape in these pics)
Her at rest;
What she can look like, if she stretches her neck down
And what she always looks like, at a gallop;
I honestly think trying to keep an arabs head in 'relaxed' position all the time is silly and unrealistic. If someone pulls on their mouth too hard? Head goes up. Something scares them? Excites them? They decide to argue with their rider? Head up. Its one thing to ask them to be in a frame while showing or doing some concentrated schooling, and I certainly think you should teach a horse to use its body most efficiently with a rider by riding back to front, but you also have to give them some leeway when it comes to breed traits.