Apparently we have different versions of collection and good dressage tests. Generally speaking, bucking through canter transitions does not constitute a nice test and dumping onto the forehand in every single downward transition does not constitute collection, but that's only my opinion.
Uta Graf is a very, very qualified rider that has ridden many of the world's top horses. As I stated before (see my previous post) "For a horse to perform upper level movements correctly in them, it is likely they were first schooled in a bit and have already developed the self carriage required to perform high level movements with a soft contact." And this is very likely the case with the horse she is riding.
To teach a horse to be soft, over the back and correctly collected is IMO not possible in a bitless bridle for 95% of horses. The pressure points are simply too much for many horses to handle, causing them to suck back behind the rider's aids.
I do not think that just because something lacks a bit it is any kinder to the horse. There are just as many, if not more pressure points touched on the horse with a bitless as a simple snaffle bridle. Why do you think putting a chain around the horse's nose works as a force control method?? Is a thin piece of leather really that much better? Gag bits are considered harsh because of the poll pressure they put on a horse, again is a bitless any kinder??
They say money doesn't buy happiness -- well happiness doesn't buy horses!