Which forum was that?
About showing collection or not, is just don't think I agree, but I can understand that they didn't find it because our forum is just getting so big. But if you look at the videos, for example of Tamarack's first rides (especially number four), you already see a real collected trot. What about Lasuria and her videos, both riding and groundwork? And Titum shows collected canter steps (altough four-beat, which modern dressage riders see as fault but was preferred by classical teachers), and Opositor also shows great moments of not only collection, but also extension in the trot...
And in the picture section, what about the piaffe and terre a terre of Beau?
But I guess the problem with modern dressage riders looking over here, that with a lot of them their definition of 'collection' is having the horse in the same (collected) frame for long periods of time. While our horses use the collection according to the exercises and the movements, and collect more or less to do them. But you won't find a head in the same position for half an hour indeed. Sjors can do a great collected trot - for a couple of steps, after which he goes into another uncollected exercise. Does that mean that he isn't collected? Not if you ask me: he is just learning more and more about collection, and is slowly extending the exercises that collect him.
Another problem is that modern dressage riders don't always know the classical collected movements, and instead view them as erratical modern movements (the terre a terre or the four-beat canter for example isn't a canter gone wrong, they are seperate exercises).
Another thing to remember is, that just because we're on this forum, posting photo's and videos, doesn't mean that we're perfect.
We're posting all that stuff exactly because we want advice and learn from the things others know and have experienced! So even if for example 80% of a video is uncollected - then it's not right to say that the horse doesn't collect. It's simply not true. The truth is that the horse is already starting to collect himself, and is learning to do it longer, better, higher etc. in the other exercises too. And his trainer just as well.
And like Josepha wrote and which is the most important thing about this forum: we're not trying to do modern dressage, achieving modern movements without bridles. Instead, our aim is to teach our horses their own, natural collection. And what is collection according to modern dressage riders? Most of them have very different ideas than classical masters (or modern classical dressage riders). Classical riders will say a horse isn't collected if the reincontact is tight, or if a horse triangulates in piaffe, or when he has bent his neck in the third vertebra. And all that is what you frequently see in the highest levels of modern (sports) dressage. Our natural collection might not be as flashy or exaggerated in movements, but is that bad for the horse? I don't think so, and rather think the opposite is the case.