Strange and Muppet, these horses are generally confined 24/7 due to injury risk. When a horse is worth multi million euro's, they tend to get bubble wrapped. When a horse is confined for so long, it's going to go silly if put out on it's own. These owners don't want to take the risk. BUT, you look at horses like Utopia and Valergo, who got out daily, including regular hacks on top of that. Now to me, THAT is how an elite horse should be living. Not locked in a stall 24/7 with occasional handwalking and a 1 hour ride.
It is taking an animal, and treating it like a machine. Totilas has NO dea that he is worth so much, NO clue that he is one of the top dressage horses (or was) in the world, nor one of the most publicised. He doesn't know that he has a fan club. He doesn't give two hoots that his stable is made of pretty wood and looks beautiful. He's a horse, with basic needs like every other horse on this planet whether retired pony, eventer, show horse, kids pony club horse etc.
I will never see eye to eye with the constant stall keeping mentality, no matter how expensive a horse is.
As I said earlier, if I couldn't keep my horse somewhere it could be paddocked regularly, I wouldn't have a horse.
Right now, I don't have the best arena - I'm training at medium level dressage in a 20x40m arena, next to a road, surrounded by cows, and on a slope. But, my horses are able to be in beautiful big paddocks, in a herd environment. They are happy as pigs in mud, and nothing fills my heart with more joy than seeing them all tearing around the paddock having a ball :)