Maizie As someone who follows dressage and competed myself (albeit at a relatively low level Adv med) sadly much of what you have said is true but it is not the norm. I was at the last Olympics in Paris specifically to watch all of the dressage and there is definitely a move to reward correctly trained horses that move with freedom and less tension. Interestingly, it definitely affected the marks. I was with a listed judge and we both agreed that generally the reason some well known competitors had done less well than previously was they had been forced to give their horses more freedom and I am absolutely for that.
The atmosphere at Versailles was electric and even getting a horse into the arena was, IMO, a real test of horsemanship let alone producing a relaxed, tension free test. I am conflicted, I've watched wonderful freestyles that have literally brought tears, I've watched some that have made me feel uncomfortable but equally I've ridden some that have been on the edge and I've felt glad to have survived.
Riding horses, particularly competition horses is not for the faint hearted, they are capable of killing you, they are powerful animals with a mind of their own and they are unpredictable. If a rider is a bit strong in the hand, or uses the curb too much in a double bridle, yup, I've been there, done that and regretted it. The trouble is, horses aren't machines they don't come with a handbook and they are all so different. As I said, I'm really conflicted, love the sport, love to watch well trained horses and riders but also aware that some riders will use short cuts to produce what they want and that is neither good for the horse nor good for dressage but I want the sport to survive.
Basic dressage is the foundation of good riding and done properly as basic schooling builds the correct musculature that will protect a ridden equine, it also give riders the skills to keep themselves and the horse safe and IMO helps to build the relationship between horse and rider.