Ooof. Sadly, I don’t think that’s an issue specific to that barn or training either. It’s discipline-wide. Just happens we have more pictures of Valegro than we do the less popular ones.
What’s telling to me too, is where the corner of his mouth naturally ends in the first photo - versus the bottom.
Small things like these, once you notice them, are very hard to ignore. And they’re everywhere… Here’s some more that show the tendency to keep the bit high up in the mouth and keep the noseband tight:
For what it’s worth, it’s not just a criticism of riders at the top level of the sport (where I will never be) either. I notice these things in my own horses too, which has lead to a very serious, very real ruthless self-reflection of how fair what I am asking of my horse is, how unskilled I am as a rider, as well as a lot of adjustments in my riding style and tack to make them at least a little more comfortable with riding.